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WRAND & CO'

SIS BRAND &.CO.S

TO H.R.H. THE PRINCE OF WALES, THE EMPRESS OF GERMANY, &c.

BRAND & CO.'S

AL SAUCE.
PRESERVED PROY SIONS
SOUPS &

SOLE ADDRESS IS A FINE TONIC AND

DIGESTIVE.
ESSENCES OF BEEF, LITTLE
MUTTON,VEAL & CHICKEN,

An excellent relish for "fish, flesh,
BEEF TEA, TURTLE SOUP 85 JELLY MAYAIR W

and fowl." -MEAT LOZENCES Escie

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NEW AND INTERESTING MICROSCOPIC OBJECTS.
£ s. d.

£ s. 2 Bacillus Typhi Abdominalis ...

E . .....
G

.... .... ....... Bacillus of Diphtheria (Loffler) False Membrane from a Child

0 3 0 Protonema of Moss

Type-slide of 100 different Species of Diatoms, the name photoBacillus of Leprosy in Section of Skin

graphed on the slide, under each specie, in case...

... o 3o Mildew in Stem of Wheat (Puccinia graminis) ...

... 0 1 0

slide of 80 different Species of Diatoms, the name photoFertile Spike of Chara, ... ... ...

graphed on the slide, under each specie, in case ... Fungus on Leaf of Potato (Peronospora infestans)

Group of about 150 Diatoms from Sendai, Japan, very perfect ... O Fungus on Leaf of Berberry (Ecidium Berberidis)

... 0 1 0 Group of 12 different Species of Foraminifera ono

Beautiful Groups composed of Eggs of Butterflies, Moths, &c. ...

LOE perfect ...

.. o! 6 Set of 24 Botanical Slides (Elementary Tissues) specially arranged Stem and Petiole of Virginia Creeper, showing defoliation ... O 1o for the use of Students, in case ... Sinve Tubes in Vegetable Marrow

... ... ... - 140 ..

... o 10
Classified List, representing a Stock of 40,000 First-class Objects sent post free or application.

MICROSCOPES AND APPARATUS.
WATSON & SONS' TRIPOD EDINBURGH STUDENT'S MICROSCOPE is suitable for investigations with the highest powers. The quality 21.

Workmanship is the finest possible, and it is unequalled for stability and convenience of Manipulation by any other medium size or Stedents

Instrument. Price from £4 59. WATSON & SONS' VAN HEURCK MICROSCOPE combines every Mechanical Convenience with the utmost Precision in all the Working parts and is Unsurpassed for Photo-Micrography and all Research of the most delicate nature.

Full Illustrated Catalogue of Microscopes and Apparatus sent Post free on application to
W. WATSON & SONS, OPTICIANS TO HER MAJESTYS GOVERNMENT,

313 HIGH HOLBORN, LONDON.
Awarded 28 Gold and other Medals at International
Exhibitions for Excellence of Manufactures.

AND 78 SWANSTON STREET, MELBOURNE, AUSTRALIA.

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60 Prize Medals Awarded to the Firm.

BE CAREFUL TO ASK FOR FRY'S PURE CONCENTRATED COCOA.

Printed by RICHARD CLAY AND SONS, LIMITED, at 7 and 8 Bread Street Hill, Queen Victoria Street, in the City of London, and Published by

MACMILLAN AND Co., at ag Bedford Street, London. W.C., and 112 Fourth Avenue, New York. - THURSDAY, April 23, 1893.

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LANTERNS

-No. 1225, VOL. 47.] THURSDAY, APRIL 20, 1893. :

[PRICE SIXPENCE. Registered as a Newspaper at the General Post Office.)

(All Rights are Reserved. NEWTON & CO'S NALDER BROS. & Co., NEW CATALOGUE OF

16 RED LION ST., CLERKENWELL, LONDON, E.C. Telegraphic Address, Secohm, Lonaon. Telephone No. 6770.

Ayrton Mather D'Arsonval Galvanometer.

ELECTRICAL
AND SLIDES.

AND
JUST PUBLISHED, 6d. POST FREE,
Contains NEW SETS OF LANTERN SLIDES on

SCIENTIFIC
HISTOLOGY. (Photo-micrographs.)
ASTRONOMY. ("* Knowledge” Series.)
AGRICULTURAL BJTANY. (Photo.micrographs.)
LIFE-HISTORY OF WHEAT. (Paoto-micrographs.)

INSTRUMENT
INJURIOUS INSECTS. (By Miss ORMEROD.)
BEES AND BEE CULTURE. (By T. W. Cowan, Esq.).
TRIP ROUND THE WORLD. (By HOWARD FARMER, Esq MAKERS.
LIFE AND WORKS OF LORD TENNYSON. (88 Slides.)
SCENES FROM SHAKESPEARE. (101 Slides.) &c., &c.

Contains, also, particulars of the most recent
SCIENTIFIC LANTERNS,

PROJECTING MICROSCOPES PRICED
PROJECTING POLARISCOPES,
&c., &c.

CATALOGUES
NEWTON & CO.,

ON (BY SPECIAL APPOINTMENT TO THE ROYAL INSTITUTION)

APPLICATION 3 FLEET STREET, LONDON.

NOW READY.18., Post Free.

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STANDARD METEOROLOGICAL INSTRUMENTS

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GRIFFIN'S ILLUSTRATED CATALOGUE

OF

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ELECTRICAL,
MAGNETIC,
& GALVANICE

APPARATUS.

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ou ready, Negretti & Zambra's Encyclopædic Catalogue of Mathematical. Philos. tical, and Standard Meteorological Instruments, containing numerous Comparative Tables of

Reference, and Ilustrated by

Twelve Hundred Engravings, Royal 8910, Cloth, Gilt Lettered, price 5s. 6d.

(Seventh Edition)

Prices reduced to date

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Royal 8vo, 144 Pages, with over 400 Illustrations. 1s. Post Free.

JOHN J. GRIFFIN & SONS, L. 22 GARRICK STREET, LONDON, W.C.

NEGRETTI & ZAMBRA, Opticians and Scientific Instrument Makers

To Her Majesty the Queen,

HOLBORN VIADUCT, 45 CORNHILL, & 122 REGENT STREET, LONDON. GUY'S HOSPITAL MEDICAL SCHOOL. COUNTY BOROUGH OF CARDIFF The SUMMER SESSION begins on MONDAY, MAY 1.

PRICE LISTS FREE BY POST TO ALL PARTS OF THE WORLD.

PUBLIC MUSEUM AND ART The Hospital contains 695 beds, of which 500 are in constant occupation.

GALLERY Special Classes are held for Students preparing for the Exam nations of the University of London and other Higher Examinations.

APPOINTMENT OF CURATOR AND SECRETARY. APPOIVIMENTS.-All Hospital Appointinents are made strictly in 1 The Museum Committee of the County Borough of Cardiff require tz accordance with the merits of the Candidates, and without extra payment. services of a CURATOR of the Museum and Art Gallery, who will also a

ENTRANCE SCHOLARSHIPS in September 1893.- [wo Open as SECRETARY to the Committee. The gentleman apo inted wil Scholarships in Arts, one of the Value of £roo, open to Candidates under

required to devote the whole of his time to the duties, and must be coapter 20 Years of Age, and one of $50, open to Candidates under 25 Years of

to Catalogue the contents of the Museum and Art Gallery, and to colles Age. Two Open Scholarships in Science, one of the Value of Ango, and Specimens for the Museum, another of £60, open to Candidates under 25 Years of Age.

The Salary will commence at £200 per annam, rising by ancual increme PRIZES are awarded to Students in their varivus years, amounting in the of £ro to £250 per annum. aggregate to more than £550.

Preference will be given to Applicants who have previously held Oase in DENTAL SCHOOL - A Dental School is attached to the Hospital

a Museum. The person appointed will be required to enter upon his Dair which affords to Students all the instruction required for a Licence in

at once. Dental Surgery.

Applications, stating Age and Qualifications, accompanied by not mat COLLEGE. -The Residential College accommodates about Fifty Students than five recent Testimonials as to character and fitness for the Appointment in addition to the Resident Staff of the Hospital, and con

must be sent to the SECRETARY, The Museum, Card.ff, and delivered on Dining Hall, Reading Rooms, and Gymnasium, for the use of the Students' before MONDAY, MAY 1, 1893 Club.

By Order, For Prospectus and further information apply to the Dean, Dr. Shaw,

JOHN BILLINGER, Secretary pro tra Guy's Hospital, London, S.E.

Cardiff, April 7, 1893.

AND

ST. THOMAS'S HOSPITAL MEDICAL

THE ELECTRICAL
SCHOOL,
ALBERT EMBANKMENT, LONDON, S.E.

GENERAL ENGINEERING COLLEGE, The SUMMER SESSION will commence on MONDAY, MAY 1.

AND
Students entering in the Summer are eligible to compete for the Science
Scholarships of £rgo and 460 awarded in October

SCHOOL OF SCIENCE.
There are Prizes and Scholarships of the value of £300. All Appoint-
ments are open to Students, without extra charge.

PENYWERN HOUSE, 2 PENYWERN ROAD, EARL'S Special Classes for the Examinations of the University of London are

COURT, S.W. held throughout the year.

A Register of approved lodgings, and of private families receiving PRINCIPAL-G. W. DE TUNZELMANN, B.Sc., M.I.E.E.
Boarders, is kept in the Secretary's Office.

Telegrams"Tunzelmann, London."
Prospectuses and all particulars may be obtained from the Medical
Secretary, Mr. G. RENDLE.

The Complete Courses qualify Students for entry into Electricaler other
G. H. MAKINS, Dean. Engineering Works.

The First Year's Course is arranged to qualify Students i'r entering

Cooper's Hill, the Central Institution Engineering College, or the Roya LONDON HOSPITAL MEDICAL

Schol of Mines.

Foriy one Students have entered these Institutions during the !» COLLEGE.

three years, and tw Entrance Scholarships have been obtained at 1

Central Institution.
The SUMMER SESSION commences on May 1.
Students entering then are eligible to compete for the Entrance Scholar-

The College is provided with very complete Laboratories and Dyna

room, and also with an extensive Geological Collection for the Preliminar ships in September and October. Twenty-four Scholarships and Prizes are Courses for Civil and Mining Engineering Students offered annually

Students are regularly sent to the College by Leading Engineers 24 Special arrangements are made to meet the requirements of Students enter

Scientific Authorities, whose Names are given in the Prospectus. ing in the Summer Session.

A reduction of 15 Guineas is allowed to the sons of Members of the
Profession,
For Prospectus and full particulars apply to Mile End, E.

MASON COLLEGE, BIRMINGHAM.
MUNRO SCOTT, Warden.

LECTURESHIP IN MATHEMATICS. Mile End, E.

The Council invite Applications on or before MAY zi for the above & pointment, the duties of which will commence on OCTOBER 2, 1893

Particulars of the Stipend, Conditions, and Duties will be seat on applica UNIVERSITY COLLEGE, LONDON.

tion to the undersigned. FACULTY OF MEDICINE.

GEO. H. MORLEY, Secretarv. The SUMMER SESSION begins on MAY 1.

The work is arranged so that a student may advantageously begin the ! GONVILLE AND CAIUS COLLEGE.
Science part of the Medical Curriculum then.
Full information may be obtained from either of the undersigned.

The Triennial THRUSTON PRIZE (about 654). open to Past and Presem

Members, will be awarded this year for Original Investigati sa E. A. SCHÄFER, F.R.S., Dean of the Faculty.

PHYSIOLOGY (including PHYSIOLOGICAL CHEMISTRY J. M. HURSBURGH, M.A., Secretary.

PATHOLOGY, or PRACTICAL MEDICINE. Copies of refer

ences to Publicati ns to be sent to the MASTER on or before JUNE 24 KING'S COLLEGE, LONDON. DIAGRAMS for LECTURERS, ILLUSBACTERIOLOGY.

TRATIONS for AUTHORS, quickly and artistically done.- J. S.,

19. Waldegrave Road, Brighton. Director of the Laboratory, Prof. CROOKSHANK, M.B.

Demonstrator, Dr. HEWLETT. The Laboratory is open daily fro.n 10a.m. to sp.m. for INSTRUCTION “NATURE.”—A Complete Set, Vols. i.-xlv., and ORIGINAL RESEARCH.

Cloth Gilt, good as New, Suitable for Library ; earlier Vols. scarce Attendance für one month, 25 58. Special Post, Graduate Course, Fridays, 11 a.m. to i p.m., 42 28.

£10 ios. net.-"M. H.," Conservative Club, Gloucester, Evening Class, Monday, 7 p.m. to 9 p.m., £2 28. Evening Class on Fermentation, Wednesdays, 7 p.m. to 9pm., 42 2s. To Collectors and Buyers of Precious and For Sylabus apply to the SECRETARY.

Fancy Stones.-R. C. NOCKOLD, Diamond and Oriental Stone Mer chant, 12 Frith Street, Soho, W., has a very large assortment of Specie

men Stones, cut and uncut. Fine Collection of Coloured Diamas THE FIRST ANNUAL GENERAL MEETING OF THE

and in Matrix. Inspectin invited. HAUSA ASSOCIATION

BARGAINS FOR SALE. Will be held, by kind permission of the ARCHBISHOP OF CANTER BURY, in the Library, Lambeth Palace, on SATURDAY, APRIL 22, at | FINE-BINOCULAR MICROSCOPE, by Ross, with Appa 12 noon precisely.

ratus and Objectives from 2 inch to l'o. Cabinets, &c. Cost about Lord ABERDARE in the Chair.

£200. Price only 6100.. Speakers :-Sir G. TAUBHAN-Goldie, the BISHOP OF Down, Major L. FIRST-CLASS ASTRONOMICAL TELESCOPE. 6 jack DARWIN, M.P., Mr. H. M. STANLEY, and others.

Object Glass, Brass Body; Finder, Day and Night Eyepieces Econ All who are interested in hearing of the work of the Ass ciation are invited torially mounted on Tripod. Price only £65. Given away.- App" to attend.

HUGHES, Brewster House, 82 Mortimer Road, Kingsland, London,

Sale by Auction.

F. H. BUTLER, M.A. Oxon., Assoc.R.S. Mines.

NATURAL HISTORY AGENCY,
TUESDAY, APRIL 25.

158 BROMPTON ROAD, LONDON. THE VALUABLE COLLECTION OF EXOTIC LEPIDOPTERA FORMED BY A. DICKSEE, ESQ.

Dsaler in Rocks, Minerals, Fossils, and other Objects

of Scientific Interest. MR. J. C. STEVENS will Sell by Auction at his Great Rooms, 33 King Street, Covent Garden, on l'UESDAY,

Collections of Rocks, Minerals, Fossils, or Recent Shells furnished in APRIL 25, at half past 12 precisely, the very Select and Valuable

accordance with special requirements. SCHOOL COLLECTIONS of SediCollection of Exotic Butterflies belonging to Arthur Dick see, Esq.

mentary and Igneous Rocks, 35 specimens of fair size in case with divisions,

1os. Rabbits and other objects for Biological Study supplied. Card Trays who is giving up collecting, comprising many Rare Species, especially nich in Ornithoptera, Papilio and Morplio, and in exceptionally fine

and Glass-topped Boxes of any required dimensions made promptly to order. and perfect condition, together with the Cabinet Drawers and Boxes in

Sections of Shells and general Lapidary's Work executed. Micro Rock

Slides new to stock -Schistose Elæ lite- Syenite, Norway: Dolerite, which they are arranged. Also a small series of fine bred specimens of P. Dispar and other British Lepidoptera, Insects in Papers, Shells,

| Rowley; Porphyritic Pitchstone, Beinn Shiant; and Sanidine Trachyte, Minerals, and other Natural History Specimens, Cabinets, &c.

Gleichenberg, On View day prior, 10 till 4, and Morning of Sale, and Catalogues had.

MINERALOGY. NATURE.-37 Vols. for Sale, Price £2 ros. SAMUEL HENSON,

Vols. 3 to 24 (1876-81), Bound; Vols. 30 to 45 (1884-9-), Unbound. All in good condition. Purchaser to fetch them away.-"F.," 97 West

97 REGENT STREET, LONDON, W. bouine Grove, London, W.

ESTABLISHED 1840.

Late 277 STRAND Choice Mineral Specimens, Gem Stones, Carved Opals, Polished Agates, Rock Crystal Balls, Fossils, Rocks, and Rock Sections.

LATEST ARRIVALS. Mr. HENSON has just received some good Groups of Japanese Stibnite. interesting Quartz Crystals inclosing Rutile and other Substances, and a Very Fine Rock Crystal Ball, 4 inches diameter, perfectly free from flaws. small Crystal Balls, with inclosures, Rock Crystal Carvings, &c., &c.; Crysiallised Hydrargillite, Bertrandite, Polyba site, Diamonds, Chalcotrichite, Arizona, Yellow Terminated Bervls, Geikielite, and Yttrolantalite. Diatomaceous Earth from Hakodati, Japan.

CONCHOLOGY.

COLLECTIONS FOR MUSEUMS FROM 65 TO 1300.

Opisthostoma

Opisthostoma ALBERT EDWARD JAMRACH mirabile.

pulchellum. E. Smith.

G. Austen.

. (Late CHARLES JAMRACH),
HELIX FULTONI.

NATURALIST,
COLLECTIONS AND SPECIMENS BOUGHT.

180 ST. GEORGE STREET EAST.
EXCHANGES MADE FOR SPECIES NOT IN STOCK.

Implements of Savage Warfare, Idols, Sacred Masks, Peruvian Pottery, GLASS-TOPPED BOXES, CARD TRAYS, &c.]

Netsukis, China, Lacquer, Gongs, Shells, and other Curios.

LIVING SPECIMENS FOR THE HUGH FULTON (Conchologist), 216 KING'S ROAD, LONDON, S.W.

MICROSCOPE. Volvox globalor, Epistylis flavicans, Stentor cæruleus, Spongilla fluviatilis, Brachionus pala, young Colonies of Cristatella mucedo, and

other beautiful objects Amoeba, Hydra, Vaucheria, and other types COLLECTIONS OF MINERALS,

(Animal and Vegetable) for Students. Specimen Tube, with Drawing ROCKS, OR FOSSILS,

and Description. One Shilling, Post Free.

T. E. BOLTON, For the Use of Scudents, Science Teachers, Prospectors, &c., and 10 illustrate the leading Text-books, in Boxes, with Trays.

FARLEY ROAD, MALVERN LINK. 50 Spocimens, 10s. 60.; 100 do., 818.; 200 do., 485. New Price List of Minerals, Rocks, and Stratigraphical Series of Fossils

THIS Post Free. ROCK SECTIONS for the MICROSCOPE from is. 63.cach, Post Free

MEDICINE CATALOGUES GRATIS.

Is unequalled in the Cure of all Disorders of the LIVER, CABINETS, GLASS-CAPPED BOXES, TRAYS, HAMMERS, &c.

STOMACH, KIDNEYS AND BOWELS. A Great PURI. always in Stock.

FIER of the BLOOD; a Powerful Invigorator of the THOMAS D. RUSSELL, System, if suffering from WEAKNESS AND DEBILITY, 78 NEWGATE STREET, LONDON, E.C.

and is unequalled in Complaints incidental to foonian NOTICE,-Advertisements and business letters for

NATURE should be addressed to the Publishers;

Editorial communications to the Editor. The MINERALOGIST AND GEOLOGIST. telegraphic address of NATURE is “ PHUSIS, SPECIAL AND TYPICAL COLLECTIONS for Students,

LONDON."
Lecturers, Museums, &c.

SUBSCRIPTIONS TO "NATURE."
EVERY REQUISITE FOR PRACTICAL WORK, also
Museum Fittings, Cases, and all Materials for Display, &c., of

Yearly. . . . . . . . . . . . . . . 1 8 0 Specimens.

Hall-yearly. ............0 14 6 COLLECTIONS OF MINERALS, FOSSILS, ROCKS, Quarterly .............0 7 6 NATURAL CRYSTALS OF MINERALS, to illustrate all TO ALL PLACES ABROAD:Elementary Works. All greatly improved.

Yearly. . . . . . . . . . . . . . . 1 10 6

Ilall-yearly. :::::::::::: NEW LISTS NOW READY.

Quarterly ..............080 And may b: had post free on application at the Repository and Museum, Money Orders payable to MACMILLAN S CO. 38 CHARLOTTE ST., FITZROY SQUARE, LONDON OFFICE: 29 BEDFORD STREET, STRAND, W.C.

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JAMES R. GREGORY,

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THE VISIBLE UNIVERSE:

A DICTIONARY
APPLIED CHEMISTRY.
By T. E, THORPE, B.Sc. (Víct., Ph.D.), F.R.S., Treas.C.S.

In Three Volames. Vols. 1. and IL price {2 21. each.

CHAPTERS ON THE ORIGIN AND CONSTRUCTION

OF THE HEAVENS.
V. III. pr.ce 43 35. Sus pastel.

By J. ELLARD GIRE, F.R.A.S., Author of “Star Groups,"

The Scenery of the Heavens," &c., &c.

WESTMINSTER REVIEW January, 1893). **Mr. Gore's * Visible Universe is one of the best books of the season and will be equally acceptable to the specialist in astronomy and to the multitude of general readers who feel an interest in that subject... The Meteorite Hypothesis of Mr. Lockyer is subjected to a searc'un enamination. The path of all that has been said in its support by Nr. Lockyer himself, and the leading objections tha' have been urged against

is vanog orters, are carefully we ghe in the balance that on retres Professor of Chemistry in the Normal School of Science and sade s there room for the saghtest complawt of unlairne-s or partiality." Royal School of Mines, South Kensinzlon.

SATURDAY BEVIEW (December 31, 1892).
A8818TED BY EMINENT CONTRIBUTORS.

“Mr. Gore evidently possesses the great advantage of an uobiassed as his judgments, so far as they g .ecpress.0.2. are moderate and reasonable: and he neither caters for popularity nor strains after effect. His book has a

serioas valde as a contribution towards the history of astronon.cal thought." NOTICES OF VOLS. I and II.

NATURE (December 24,-1892). CHEMICAL NEWS. -"Will be universally appreciated by technical “Mr. Gore has already acquired considerable success as a popular writer and manufacturing chemists."

on astronomical subjects, and the scheme of the present volume is, as we JOURNAL OF SOCIETY OF CHEMICAL INDUSTRY._" The might expect, a very good one. ... The Meteoritic Hypothesis is deat list of the names of contributors and the selection of their sabjects

with in considerable detail, and here Mr. Gore is most seriously in error. inspires confidence at once."

1... The whole of the objections' of the 'opponents' of Prot. Lockye TRON AND STEEL TRADES JOURNAL._" Should be in the

recorded by Mr. Gore are on matters of secondary importance, and bars bands of cvery manufacturer who wishes to be well posted in the subjects

been insisted upon by him owing to his complete misconception of the

theory. As a guide to the Meteoritic Hypothesis his chapter is misleados with which he has to do."

and etterly valueless, either as exposition or criticism. .. He gives 2 CHEMICAL TRADE JOURNAL.-"We are much pleased with the work.,.. Descriptions of processes are brought down to as recent a date

i interesting and valuable summary of the present state of our knowledge a as it is well-nigh possible to achieve, ... Will form a haady book of

to star distribution and in ove nent and the construction of the universe reference for years to come."

For this portion of the book we have nothing but praise." SCIENCE AND ART _“Is by far ahead of anything of the kind in 1

ATHENÆUM (March 25, 1893). our language. The book is clearly written, appropriately illustrated, and 1

“The author's previous astronomical works are well known, and the an honour to all concerned in its production. Undoub:edly, it will occupy

present can hardly fail to be welcomed, as giving an interesting explanatua the first place as a work of reference on the shelves of our libraries for many

and discussion of the theories which have been evolved and supported be years to come, and will be found very useful to all members of the medical

men of science regarding the construction of the heavens and the extent of profession, as well as to people engaged in the arts and the numerous

1 the visible universe. ... The so-called Meteoritic Hypothesis is failr branches of industry throughout the country."

discussed, as well as the objections, which, as has already been pointed on SIR H. E, ROSCOE in NATURE." It is probable that this volu ne i in these columns, are fatal to its acceptance. We must conclude with 23 will have even a larger sale than that of the corresponding Dictionary of Pure Chemistry,' and, as with that important work. So with this, the public

earnest recom nendation to our readers to study the book for themselves." may well be congratulated on possessing snch a valuable book of reference CROSBY LOCKWOOD & SON. 7 Stationers' Hall Court, Londo. EL so creditable to all concerned in its production. ... An examination of the important articles written by specially qualified contributors indicates that cach subject is brought up to the level of the present state of our knowledge. ... Is a welco ne addition to our scientific books of reference, and forms an admirable companion to 'Watts' Dictionary of Theoretical Chemistry.""

OR,
London : LONGMANS, GREEN, & CO.

OF MATTER
By " WATERDALE."

Crown 8vo, 55.

A hydro dynamic reason in full detail for the action of grazitCAMBRIDGE.

gruous with Newton's laws.

Hydro mechanical reason for differences of weight of the unit of valage

each kind of atomic matter : from which the coastancy of the prodes f QUARTERLY JOURNAL OF THE GEOLOGICAL specific weight into heat is explained. Weight is not a measure

SOCIETY. Vols. 18 to 21, 23, 26, 27, 30 to 34, 35 parts 1 to 3, 36 parts! quantity. Heat, or its applied quantity, is itself the measure of the end 1 to 3, 37, 38 part 2, 39 part 1, 40 to 47. 6 vols. bound, the rest as pub atomic volumes, or real quantity of matter set in vibration (all ng at lished. 1862-91. £5 53.

compound motion). Specific heats have been arrived at by dividing » GEOLOGICAL MAGAZINE, 1879, 1881 to January 1892. applied quantity of heat by the weight of a substance. And the re-out ni vols , Cloth, the rest in parts. £3 38.

plication of the quotient by the specific weight is simply a correctioa of the GEOLOGIST, THE. A Popular Monthly Magazine of

| error; and produces constancy.
Geology. Nos. 2 to
BRODIÉ. History of ihe Fossil Insects, 1845. 8s.
U logy:

CHAPMAN & HALL, LTD., London, W.C.
NOS: 2 to 46, 57, 59, and 60. 48 numbers. 1858-62. 155.
DE LA BECHE. The Geological Observer, 1851. 145.

Just Published, Large Crown 8vo, with numer ju; Illustrations, iós. Cox DE LA BECHE. Geological Manual, 1833. 45. 6d. THE IRON ORES of GREAT BRITAIN and GEOLOGICAL RECORD, 1874, 1875, and 1876. 3 vols. IRELAND: their Mode of Occurrence, Age, and Origin..

6s. GEIKIE. Text book of Geology, 1882. 125.

and the Methods of Searching for and Working them. LYELL. Principles of Geology. Eleventh Edition. 2 vols.

With a Notice of some of the Iron Ores of Spain. By

J. D, KENDALL, F.G.S. 1872. 62 28. MILLER. The American Palæozoic Fossils, 1877. 45. 6d.

SUMMARY OF CONTENTS :-Part I. Historical and Statistical Notes --SALTER.

Part II. Geological Position. Form, and Inner Nature nf Iron Ore Deposits Catalogue of Cambrian and Silurian Fossils. - Part II The Age and Origin of the Deposits. - Par: IV. Searching for Preface by Adam Sedgwick 1873. 7s.6d.

and Working Iron Ores. SCROPE. On Volcanos, 1872. 73. 6.1. WALLACE, A, R. Island Life. 8vo. 1880. 125.

London : CROSBY LOCKWOOD & SON,

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WATERDALE RESEARCHES;

FRESH LIGHT ON THE DYNAMIC ACTION AND PONDEROSITY

GEOLOGICAL WORKS ON SALE BY MACMILLAN & BOWES,

Now Ready, 8vo, Sewed, 5s. The GEOLOGY and PALEONTOLOGY OFFICIAL REPORT OF THE INTER

of QUEENSLAND and NEW GUINEA With 68 Plates and a NATIONAL CONGRESS OF EXPERIMENTAL PSYCHOLOGI Geological Map By R. L. JACK and R. ETHERIDGE, Jun. 3 Second Session. London, 1892. Vols. 4to, 62 25.

WILLIAMS & NORGATE, 14 Henrietta Street, Covent Garden DULAU & CO., 37 Soho Square.

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