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NATURE.

The number for last week (Sept. 30) contained :-
Appreciations of Carl von Linné. By B. D. J.
India-Rubber Manufacture. By C. S.
Vector Analysis.

Retaining Walls and Road Bridges. By T. H. B.
Our Book Shelf.

Letters to the Editor :

Visibility of Halley's Comet. W. F. DENNING.-The
Presence of Hæmoglobin in Invertebrate Blood.
GEOFFREY SMITH.

Magnetic Storm of September 25.

Aviation. (Illustrated.) By Prof. G. H. BRYAN, F.R.S. The Royal Observatory and Electric Tramways

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"ALL books of physics agree as to the length of these waves. Indeed the whole theory depends upon them. And, to produce Sound, by the theory, they must enter the ear, every ear, without disarrange. ment; an absolute impossibility.

"But all will agree that if it was possible for them to form, there must be room for them to form in. That is, there must be at least 70 feet of space for the longest one. between the sounding body and the ear, the others proportionally. But, as every one can learn by experiment, there isn't a sound thus represented but can be heard perfectly, uttered close to the ear, with less than three inches between it and the auditory nerve. This fact alone shows the utter absurdity of the whole theory.

"That anything in the shape of waves 70 feet long, or one foot long, or of any length, could circulate in air, in all directions, and in all times, or in fact at any time, the radius of a sphere, thus entering ten thousand different ears, more or less, without in the slightest changing their form is an inconceivable absurdity.

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"Rev. James Challis for many years Professor of Astronomy at Oxford University, England, says:

'The possibility of hearing distinctly words spoken at a distance, depends on the faithfulness with which the air transmits the impressions made on it by the organ of voice. As the difference between the sound of one letter and that of another corresponds to a difference in the form of the curve representing the succession and magnitude of the condensations impressed, it is necessary that the form should remain unchanged by distance of transmission in order that words heard at different distances may be the sounds.'

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REYNOLDS & BRANSON, Ltd. PASTORELLI & RAPKIN, LTD.

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ESTAB. 1750.

46 HATTON GARDEN, LONDON, E.C. ACTUAL MANUFACTURERS of all kinds of Meteorological Instruments. CONTRACTORS TO H.M. GOVT.

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The "University" Lantern, with Russian Iron body, sliding baseboard, two superior objectives, condensers 41" diam., plane silvered mirror "A," which is moved by a knob causing the rays to be reflected upwards for the projection of objects in a horizontal plane, prism with silvered face which can be used at "C," or as an erecting prism in mount "D," lime-light burner, slide carrier. Price complete in travelling case, without adjustable table... £9 10 0 10 19 6

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Catalogue of Lanterns, &c., 24 pp., post free. 14 Commercial Street, Leeds.

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THURSDAY, OCTOBER 7, 1909.

TWO BIRD BOOKS.

(1) Birds of the World: a Popular Account. By Dr. Frank H. Knowlton. With a chapter on the Anatomy of Birds, by Frederic A. Lucas; The whole edited by Robert Ridgway. Pp. xiii+873. (New York: Henry Holt and Company; London: Constable and Co., Ltd., 1909.) Price 30s. net. (2) Birds Useful and Birds Harmful. By Otto Herman and J. A. Owen. Pp. viii+387. (Manchester: The University Press, 1909.) Price 6s. net. (1)T would seem that there is no satisfying the IT demand for books on birds. Every year places before, not the scientific ornithologist only, but the general reader, in this country, scores of volumes on this group of animals, which must indicate a ready sale for them. The taste for natural-history works has unquestionably been growing in England at a rapid rate during the last decade among all classes of the community, instigated and encouraged largely by the non-technical manner in which so many treatises of the highest scientific authority are being published for the general reader, the majority of them lavishly illustrated, as well as by the issue of so many local faunas, which give an impulse to the study of the species to be found in their own neighbourhood by

those into whose hands the books fall.

The

Imitation is the sincerest flattery, we know. "Birds of the World," the first of the two volumes on our list, is one of the American Nature series, projected by Holt and Company, of New York, to which the leading scientific men of America are to contribute. This volume, however, compares disadvantageously in one respect with those of the English Nature series, in handiness and comfort in reading or consulting. It is an octavo measuring 10 inches long by 7 inches wide, and nearly 3 inches thick. It contains 873 thick pages, and turns the balance at more than 4lb.; it might be termed a bi-manual, or perhaps more appropriately a table-edition. In respect to its contents, the book stands on a high pedestal of

excellence.

The demand for books on birds seems to be developing in America as rapidly as it is doing in England, for the Nature series of the United States is due, as the preface assures us,

"to the great awakening of popular interest . . . in recent years in relation to our birds, an interest that has been fostered not only by the admirable work of the Audubon societies and the widespread nature teaching in the schools, but by the deeper, broader sentiment which is leading back to, and nearer to, nature. The increasing number of people yearly turning back to the country, either for recreation or permanent residence, has naturally stimulated a desire to know more intimately their surroundings-the trees, the flowers, the birds."

The three names which appear, as authors or editor, on the title-page are a sufficient guarantee that the desire of the migrant to the country to know more, not only about the birds of the United States, but of those of the globe generally, will be gratified amply, ac

curately, and in a manner likely to foster personal observation of those species within the reader's reach.

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After an introductory chapter dealing with definitions, and such questions as pterylosis and feather structure, nests and eggs, we are presented with clearly, concisely written chapters on the anatomy of birds, their geographical distribution, migration and classification. The various subclasses and orders of birds are then dealt with in twenty-one further chapters. Dr. Knowlton recognises two subclasses-Archæornithes, with unique representation in the Archæopteryx, and Neornithes, containing all other birds, which he divides into twenty-one orders. Had space permitted, we should feel tempted to demur at the 99 tree to the Hesperposition assigned in the avian ornithiformes and Ichthyornithiformes, and to the Palamedeæ and Opisthocomi. Taking the author's brigading as it stands, we find each of the orders The habits discussed in a very interesting manner. and life-history of all the more important species in each are described concisely, as space demanded much condensation; yet nothing essential or really important is omitted to enable the reader to obtain an excellent grasp of each group. The illustrations are very numerous, and, with a few exceptions, excellent. There are 233 black-and-white blocks, many of them full-page; of the latter, some of the best are reproductions of those beautiful life-like groups with scenic backgrounds

which form one of the most attractive features of the American Museum in New York. The representation of the young hoatzins is specially instructive. Where the blocks, however, have been made from coloured plates in such works as Schlegel's "Diergaarden" or the Zoological Society of London's publications, the results have proved less satisfactory, inasmuch as the yellows and reds of the originals have come out too dark. The smaller text-figures also leave something to be desired, occasionally, in the clear definition of markings on the plumage. Of the sixteen full-page plates reproduced in the three-colour process, with which the volume is further embellished, specially noteworthy are those of the mandarin-duck, the rackettailed kingfisher, and the lesser bird of paradise. The figure of the kiwi on p. 29 is taken, we presume, from a drawing of the type which was mounted for Lord Stanley's collection at Knowsley, before the correct attitude and habits of the apteryx were sufficiently known either to scientific men to taxidermists. Buller's "Birds of New Zealand" would have supplied a better model.

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The information contained in the "Birds of the World" is, as already remarked, nearly everywhere up to date, and very accurate; but the omission of any reference to the Phororachidæ is surprising. In regard to the moa, the bird is described as being absolutely wingless. Evidence, however, was obtained from a turbary deposit near Omaru proving that certainly one species of Dinornis possessed a humerus that functioned in its glenoid cavity on the scapulo-coracoid; and, if the writer be not mistaken, a small bone is in existence in New Zealand very similar in form to that described as belonging to the humerus of Epyornis. The moa had probably, therefore, a diminutive wing like

that of the kiwi. With regard to the question whether the Maoris ever saw the moa, it is stated on p. 81 that "it appears that the Maoris have only been in their present location for about ten generations, or some 250 or 300 years, and the moa could hardly have lived within that period, and it is held as probable that their extinction was several centuries earlier than this."

Definite evidence of the contemporaneity of the Maori and the moa was adduced some eighteen years ago, during the exploration of the Sumner Cave, near Christchurch. The mouth of this rock-shelter had been closed by a landslide before the arrival of the Europeans in the South Island, the result, probably, of an earthquake, while a meal was in progress. The -occupants succeeded in escaping, but round the fireplace about which they had been sitting were found moa bones and portions of the eggs, with the shellmembrane intact, on which they had been feasting. On the floor near by lay a boat-bailer and other objects with the carving truly characteristic of the Maori upon them.

Of the three specimens of the now extinct Dromaeus ater discovered, and brought to Europe by the French -expedition under Baudin, all have now been located, as stated in the work before us-two in Paris (a skeleton and mounted specimen), and one (a skeleton) in Florence. A fourth specimen, it might have been mentioned, is now in the Lord Derby Museum, Liverpool, and was exhibited at the International Ornithological Congress in London by the Hon. Walter

Rothschild on behalf of the director of that institution. As to the black swan of Australia, it seems extremely probable that it was indigenous to New Zealand as well as to the island-continent. The bones of a species, described under the name of Chenopis sumnerensis, hardly differing from those of Chenopis atrata, were found among the débris of the disturbed meal referred to above in the Sumner Cave, as well as in an ancient kitchen-midden in the Chatham islands.

A very full index completes this very excellent, succinct, and trustworthy account of the "Birds of the World," and we hope it will, despite is bulkiness and weight, meet in the United States, and in England also, with the appreciation it fully deserves. (2) The second volume in the list given above is of a very different character, and the reason for its publication in this country is not very apparent.

The book is a translation of portions of the valuable work prepared by the director of the Royal Hungarian Ornithological Bureau to enable landowners, farmers, fruit-growers, and gardeners in that country to discriminate their avian friends and foes, together with a somewhat well-worn account, padded with poetical quotations, by Mr. J. A. Owen, of a selection of our most common English birds, including always the statement whether the species is harmful or useful in England, which seems to be apparently the only excuse for Herr Herman's book (in part) appearing in an English garb. The English co-author believes that amongst the innumerable books on bird-life which have been published of late years "there has been a lack which this little volume may supply."

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From a careful reading of the work we can really discover very little not to be found in nearly every book on British birds. It includes also a few species, common in Hungary, which rarely visit England, or are only winter visitors which can trouble the English agriculturist but little. It lacks, moreover, the details arranged on a regular scientific basis" and "the investigations with regard to the food of birds carried on by a fully qualified entomologist" upon which Herr Herman has proved the various species of Hungary to be useful or harmful, and which would have impressed the corresponding classes of readers in England as those for whom the volume was prepared in Hungary. A more thorough work on the economic value of birds in the English language is to be found in the Bulletins of the U.S. Department of Agriculture, which contain the life-history and the detailed results of the examination of hundreds of individuals of each species, including nearly as many English ones as are given in the volume under review.

Birds Useful and Harmful" may, nevertheless, assist in spreading the knowledge of those birds, persistently persecuted, that deserve protection.

A GROUP OF "FLORAS."

F.

By

(1) A Tourist's Flora of the West of Ireland. R. L. Praeger. Pp. xii+243; with 5 coloured maps, 27 plates, and 17 figures. (Dublin: Hodges, Figgis and Co., Ltd., 1909.) Price 3s. 6d. net. (2) Illustrated Guide to the Trees and Flowers of England and Wales. By H. G. Jameson. Pp. xi+136. (London: Simpkin, Marshall and Co., Ltd., 1909.) Price 2s. 6d. net.

(3) Flora Koreana. Pars Prima. By T. Makai. (Journal of the College of Science, Imperial University of Tokyo, Japan, vol. xxvi., article i., 1909.) (4) The Botany of Worcestershire. An Account of the Flowering Plants, Ferns, Mosses, Hepatics, Lichens, Fungi, and Fresh-water Algae, which grow or have grown spontaneously in the County of Worcester. By J. Amphlett and Carleton Rea. Pp. xxxiii +654. (Birmingham: Cornish Bros., Ltd., 1909.) Price 25s. net.

(MR.

R. R. L. PRAEGER'S book is a solid contribution to the subject of phytogeography, and is increased in value by the many beautiful, mostly full-page, photographs of striking species of plants, some of which appear for the first time, as here illustrated. Coloured and uncoloured maps of the districts described or of the distribution of species add to the usefulness of the book, which is well indexed and singularly free from typographical errors. The introduction contains a short account of the physical features of the west of Ireland, of its, mainly edaphic, plant formations, and of the more remarkable features of its flora. The topographical section which follows contains valuable information on the character of the flora of the numerous regions selected for description. This sec-., tion will appeal to the touring botanist, more especially as the information given is not purely botanical. The author might have expanded this section, with advan-,

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tage to the inquiring tourist to whom the west is unknown.

The systematic section forms half the book, and follows mainly the classification and nomenclature of the London catalogue. Pilularia globulifera is wrongly placed in the Selaginellaceæ. The distribution of each species is recorded, and in many cases it is due to the work of the author that the distribution is now known to be so extensive. First records are duly credited to the discoverers, and many interesting observations are embodied in the text. The Saxifrages and the heaths, e.g., are adequately treated. The book can be well recommended for the sake of its illustrations, and would be worth purchase if it had none. It does justice to the delightful botanical and other attractive features of the west, and is a credit to author and publisher.

given. New species and varieties are described in Latin, and usually illustrated. The index is inadequate. It is necessary to search the body of the work for the novelties, and there is no general index to the contents of the plates. It is impossible to discuss the contents of the volume in detail. One illustration must suffice for comparison with our flora. The beautiful genus Acer is represented by fifteen species or varieties. Trifolium by one species only.

(4) This work deals in a comprehensive manner with the flowering and flowerless plants of the county of Worcester. In an introduction of twenty pages justice is done to earlier publications, Lees and Mathews being specially noted. The authors follow the London Catalogue in the names of the species, adding useful synonyms. First records are duly credited, and valuable specific distinctions are occasionally added. Some of the notes, now and then amusing, are often loosely worded, and might sometimes have been omitted with advantage. The mosses and liverworts are listed by J. E. Bagnall, and the fungi by C. Rea, both authorities on their groups. It is a little disconcerting to find Protonema muscicola, Ag., recorded as a fresh-water alga (crowding about the bases of moss-stems)! Throughout the book derivatives of the Latin names are given. A map showing the botanical areas of the county is an excellent feature. The book is a distinct advance on previous publications on WorIncestershire botany, and should stimulate interest in field botany in the county. The price is high for a county flora, but local patriotism will probably rise to the occasion. T. J.

(2) The avowed object of the writer of this book is to enable readers, knowing little of botany, by its use to give names to the plants they find, the name being, the writer insists, the first essential. This idea is not at all in keeping with recent views on nature-study. Still, every student of botany should learn to name a plant by the help of a "flora." Teachers know how students, even with the keys in our best floras, fail from time to time to name a plant. In the book under review all flowering plants are divided into ten sections. One section-flowers in heads or umbels-includes the Papilionaceæ. another section-flower parts in threes or sixesRumex occurs between Triglochin and Luzula. The section devoted to aquatic plants will prove useful. Monocotyledons and Dicotyledons are not differentiated. Ruscus is said to have " phyllodes" as leaves. This is one of the few cases in which botanical terms are introduced.

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The second part of the book is devoted to a selected number of natural orders, and more especially to the means of identification of the species of different genera, arranged alphabetically. This is the most useful part of the book. The illustrations, though small, are generally good. Misprints are few. There is, however, no index. The book is cheap, and will prove serviceable to the reader who already knows his natural orders fairly well.

(3) Mr. Makai's work is indicative of the line followed by Japan on the absorption of a new province into its empire. Korea was quite recently annexed, and so early as 1906 Makai began his study of its flora. The systematist of Japan is to-day doing as the British systematists did at the time England first acquired and explored her colonies.

This first part of the "Flora Koreana" deals with the Polypetalæ and certain Gamopetalæ, and is well illustrated by fifteen plates (one or two of which are rather crowded) of plants mostly new to science. Though printer's errors are numerous and generally indicated in a list of errata, the volume is produced in a form in keeping with the high standard of the other publications of the College of Science of Tokyo. The keys to the genera, and, under each genus, to its species, are useful. Under each species its bibliography, habitat, distribution, and Japanese name are

GEOLOGY OF NEW YORK CITY.
Geology of the City of New York. By L. P.
Gratacap. Pp. x+232; with 65 figures and 4
York:
maps. Third edition, enlarged. (New
Henry Holt and Co., 1909.)

THIS

'HIS general treatise on the underlying structure of the city of New York and its immediate surroundings appears to be the amplification of a shorter work on the same subject, printed privately for the author. Its outlook is local, and, as the interpolated "Class Directions" indicate, it is intended primarily for use in the instruction of the inhabitants of the great city. It is compiled from various sources, which are duly acknowledged, and contains, besides, some original observations, but these are not sufficiently important or numerous to appeal to the wider circle of geologists who have no particular interest in the locality. In many passages it emphasises the transformation wrought by man on the original aspect of the country, in deference, no doubt, to the naïve astonishment with which the average towndweller receives such information.

New York is one of the few great cities founded upon crystalline schists. Some of the problems of the schists and their entangled igneous intrusions are touched upon by the author, but his grasp is hardly adequate for their unravelling. As in almost every similar region, diverse views are held respecting the age of the different members of the schistose series.

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