Royal Dublin Society, June 20.-Prof. W. Noel Hartley, F.R.S., in the chair.-On the supply of water to leaves on a dead branch: Prof. H. H. Dixon. The fading of leaves on a branch killed by the application of heat is shown experimentally to be due in many cases at least to the introduction into the transpiration current of substances which cause a loss of turgescence of the leaf cells; consequently this fading does not prove that the water supply in these cases is inadequate, but rather that it is contaminated. A diminution, however, of the water supply may be caused by the high temperature, if this latter determines the rupture of the water columns of the tensile transpiration current or brings about the exudation of clogging substances into the conducting tracts from the dying cells. The conclusion, based on the withering of leaves on a killed branch, that the intervention of living cells is necessary to the elevation of the sap is thus rendered superfluous.-On the diagnosis of the eye by means of pinhole-vision: Prof. W. F. Barrett, F.R.S. The self-examination of the eye by looking through a pinhole in an opaque screen was termed entoptic diagnosis by Listing, who submitted this method to careful examination more than fifty years ago. The author was independently led to a similar discovery by noticing fixed shadows on his own retina when a bright spot of light was looked at. These shadows proved to be due to cataract, and led the author to the construction of an instrument which he calls an entoptoscope, whereby the patient can easily draw the exact extent of the obscuration in either eye. By means of two closely adjacent pinholes in a revolving diaphragm in the eye-piece and a transparent scale, the actual magnitude and position of the opacity in the eyeball can be accurately determined.-On secondary radiation (part iii.): Prof. J. A. McClelland. A continuation of the author's researches.

PARIS.

Academy of Sciences, July 10.-M. Troost in the chair. -On a calculation of the elastic resistance offered by a tube without longitudinal tension to inflation by a contained liquid column: J. Boussinesq.—On some experiments relating to the radio-activity induced by uranium : Henri Becquerel. This paper contains a study of the properties of the body formerly discovered by precipitation from the mixed barium and uranium chlorides by sulphuric acid, and since probably identified with Crookes's uranium X. It shows a remarkable stability of activity at very high temperatures. On the treatment of trypanosomatous disease (surra, mbori) by arsenious acid and trypan red: A. Laveran. Extending his investigations on this method of treatment, the author has definitely cured the disease in dogs, animals in which it has always previously proved fatal. No trace of infection could even be found in the blood of the cured dogs. On the treatment of bone fractures by movement: J. LucasChampionnière. This new method follows a law which surgery hitherto has ignored, that, in spite of their rigidity, bones, like other tissues, require movement to ensure the vitality necessary for recuperation. The practice which the author follows is a peculiar form of massage, and not only conduces to the formation of the hard tissue, but is also favourable to the quick reparation of other neighbouring organs, such as muscles and tendons, involved in the fracture.On the use of rockets against hail: E. Vidal. This paper explains how they are effectual in those cases where the storm centre is at a low altitude.-Researches on algebraic integrals in the motion of a solid heavy body about a fixed point: Edouard Husson. On a new preparation of rubidium and cæsium: L. Hackspill. The author finds that these metals can be obtained by a method similar to that for obtaining potassium or sodium, viz. by reduction at a dull red heat of the alkaline chlorides with calcium. The resulting metal does not even attack glass.-A comparison of properties, tests, and classification of ternary steels: Léon Guillet. On the molecular transformations of hydrated ferric sulphate: A.

Recoura. If a concentrated solution of ferric sulphate be allowed to stand for some days a deposit forms, which rapidly grows until the liquid becomes practically solid. This occurs through the formation of a mixture of basic sulphate and free acid.-On dextro-dilactide: E. Jungfleisch and M. Godchot.-On the hydrogenation of the ketoximes. A synthesis of new amines: A. Mailhe. Among others, acetoxime by reduction with finely divided nickel gives a mixture of isopropylamine and di-isopropylamine. On the synthesis of a new leucine: L. Bouveault and René Locquin. This body is probably one of the four possible amino-butyl-acetic acids.-On sparteine, and the symmetric character of the molecule: Charles Moureu and Amand Valeur.-On a sulphate of chromium which resists the action of reagents: Albert Colson.-On the figures formed by pressure or percussion on plastic crystalline metals: F. Osmond and G. Cartaud. These consist of groups of lines, curved on iron, straight on other plastic metals of the cubic system.-On some points in the morphology of the schizopods: H. Coutière. On the segmentary organs at the moment of sexual maturity among the Hésionians and the Lycoridians: Louis Fage. On the retraction of the mouth in the Chetopods : C. Viguier.-On an estimation of the red corpuscles in human blood made at the summit of Mont Blanc: Raoul Bayeux. After giving a table of results, the author concludes that a rapid increase in the number of red corpuscles takes place with increasing altitude. This number soon falls off with some rapidity, but remains abnormally high even some time after a return to the lowest point.On intestinal poisons (their nature, and precautions to be taken against them): MM. Charrin and Le Play.-On the preparation and properties of protoplasmic extracts from blood corpuscles: Auguste Lumière, L. Lumière, and J. Chevrotier.-On the activity brought about in pure pancreatic juice by the combined influence of colloids and electrolytes: Larguier des Bancels. An inactive pancreatic juice becomes under these conditions capable of digesting albumin.-On the decomposition of albuminoids by Actinomyces: E. Macé. On the Tertiary beds of Ouennougha and Medjana (Algeria): E. Ficheur and J. Savornin.

Current Accounts. 2% Interest allowed on minimum
monthly balances when not drawn below £100.
Deposits. 21% Interest allowed on Deposit Accounts.
Advances made. Stocks and Shares bought and sold.
Apply C. F. RAVENSCROFT, Secretary,

Southampton Buildings, High Holborn, W.C.

SECOND-HAND TOURIST TELESCOPES.

SEVERAL SPECIAL BARGAINS.

() Military Regulation Telescope, Power 20, £1 5s. (2) Military Signalling Telescope, Power 25, 2 1/8 glass, £1 10s. (3) Military Fortification Telescope, Power 35, 2 3/8 glass, £2. (4) Admiralty Cadet Telescope, £1 5s. (5) Admiralty Coastguard Telescope, £1 10s. (6) Several Target Telescopes suitable for Rifle Clubs, from £2 10s. A large quantity of Stands for these Telescopes, from 15s. to 25s.

These Telescopes are by the leading London Makers.
A.

CLARKSON

TELESCOPE MAKERS,

CO.,

WATKINS & DONCASTER,

Naturalists and Manufacturers of

CABINETS AND APPARATUS

FOR ENTOMOLOGY, BIRDS' EGGS AND SKINS, AND ALL
BRANCHES OF NATURAL HISTORY.

SPECIAL SHOW-ROOM FOR CABINETS.

N. B. For Excellence and Superiority of Cabinets and Apparatus, references are permitted to distinguished patrons, Museums, Colleges, &c. A LARGE STOCK OF INSECTS, Birds' eggs AND SKINS. SPECIALITY.-Objects for Nature Study, Drawing Classes, &c.

Birds, Mammals, &c., Preserved and Mounted by First-class Workmen true to Nature.

All Books and Publications on Natural History supplied.

36 STRAND, LONDON, W.C.
(Five Doors from Charing Cross.)

New Catalogue (102 pp.) just issued, post free.

ROCKS, MINERALS, FOSSILS. For Collectors, Students, Technical Schools, Colleges, &c. COLLECTIONS IN POLISHED DEAL BOXES. 25 Specimens, 5/6; 50 do., 10/6; 100 do., 21/-; 200 do., 42/20 Coal Measure Rocks and Fossils, 12/6; do., larger, 15/-. Adapted for the Board of Education Examinations in Geology, Physiography, and Mineralogy. A large stock of Minerals, Rocks, Fossils and Microscopic Objects for selection. Specimens sent on approval.

Cabinets, Geologists' Hammers, Chisels, Card Trays, Glass-capped Boxes. Models of Crystals. &c., &c.

NEW CATALOGUE POST FREE. THOMAS D. RUSSELL. 78 Newgate St., London, E. C.

MICROSCOPICAL PETROGRAPHY.

Gentlemen interested in the above study are invited to send to JAMES R. GREGORY & CO.,

I Kelso Place, Kensington Court, London, W., for a Prospectus of THE TWENTIETH CENTURY ATLAS OF MICROSCOPICAL PETROGRAPHY, now being issued in Twelve Monthly Parts, each Part containing Four Fine Half-Tone Plates, and also Four actual Rock Sections. Subscription in advance, either Monthly, 7/-: Quarterly, 21/-; or for the whole Series of 12 Monthly Parts & 48 Sections, £4 4s.

LIVING SPECIMENS FOR
THE MICROSCOPE.

Volvox, Spirogyra, Desmids, Diatoms, Amoeba, Arcella, Actinosphærium, Vorticella, Stentor, Hydra, Floscularia, Stephanoceros, Melicerta, and many other specimens of Pond Life. Price 15. per Tube, Post Free. Helix pomatia, Astacus, Amphioxus, Rana, Anodon, &c., for Dissection purposes. THOMAS BOLTON,

25 BALSALL HEATH ROAD. BIRMINGHAM. MARINE BIOLOGICAL ASSOCIATION OF THE UNITED KINGDOM. THE LABORATORY, PLYMOUTH. The following animals can always be supplied, either living or preserved by the best methods :

Sycon; Clava, Obelia, Sertularia; Actinia, Tealia, Caryophyllia, Alcy. onium; Hormiphora (preserved); Leptoplana; Lineus, Amphiporus, Nereis, Aphrodite, Arenicola, Lanice, Terebella: Lepas, Balanus, Gammarus, Ligia Mysis, Nebalia, Carcinus; Patella, Buccinum, Eledone. Pectens Bugula, Crisia, Pedicellina, Holothuria, Asterias, Echinus, Ascidia, Salpa (preserved), Scyllium, Raia, &c., &c. For prices and more detailed lists apply to Biological Laboratory, Plymouth.

THE DIRECTOR.