[APRIL 29,1915 

252 NATURE 
_ Towards Racial Health. By N. H. March. Pp. 
Ix+ 326. (London: G. Routledge and Sons, Ltd.) 
38. 6d. net. 
Journal of the Natural History and Science Society 
of Western Australia. Vol. v. Pp. 109. (Perth, 
W.A.: V. K. Jones and €o.) 2s. 6d. ‘ 
Castration of Domesticated Animals. By Profs. 
F. S. Schoenleber and R. R. Dykstra. Pp. x+154. 
(New York: Orange Judd Co.; London : Kegan Paul 
and Co., Ltd.) 1.25 dollars net. i 
The Syrphidz of the Ethiopean Region based on 
Material in the Collection of the British Museum 
(Natural History), with Descriptions of New. Genera 
and Species. By Prof. M. Bezzi. Pp. 146. (London: 
Longmans and ’Co., and others.) 6s. 
Catalogue of the Amatida and Arctiadze jn the 
Collection of the British Museum. By Sir G. F. 
Hampson. Plates j.-xli. (London: Longmans and 
Co., and others.) 11. 313s. 6d. ° 
British Museum (Natural History). Instructions for 
Collectors. No. 12. Worms. Pp. 23. (London: 
British Museum, Natural History.) 3d. 
A Revision of the Ichneumonide based on the Col- 
lection in the British Museum (Natural History), with 
Descriptions of New Genera and Species. - Part iv. 
Tribes Ioppides, Banchides, and Alomyides. By C. 
Morley. Pp. x+167. (London: Longmans and Co., 
and others.) 6s. 
Catalogue of the Fresh-water Fishes of Africa in 
the British Museum (Natural History). Vol. iii. By 
G. A. Boulenger. Pp. xii+526. (London: Long- 
mans and Co., and others.) 2/. 5s. 
British Museum (Natural History). 
arctic j 
British Ant- 
(“Terra Nova”) Expedition, 1910. Natural 
History Report. Zoology. Vol. ii. No. 4. Pp. 
61-112. Mollusca. Part 1. By E. A. Smith. (Lon- 
don: Longmans and Co., and others.) 4s. 
British Museum (Natural History). British Ant- 
arctic (“Terra Nova”) Expedition, 1910. Natural 
History Report. Zoology. Vol. i. No. 3. Pp. 
85-124. Cetacea. By D. G. Lillie. 
mans and Co., and others.) 7s. 6d. 
Chinese Forest Trees and Timber Supply. By N. 
Shaw. Pps Sie (London: T. Fisher Unwin.) 
(London : Long- 
tos. 6d. net. 
Photomicrography. Third edition. Pp. 36. (Lon- 
don: Kodak, Ltd.) 3d. 
A History of Persia. By Lieut.-Col. P. M. Sykes. 
2 vols. Vol. i. Pp. xxvi+544. Vol. ii. Pp. xxii+ 
565. (London: Macmillan and Co., Ltd.) sos. net. 
DIARY OF SOCIETIES. 
THURSDAY, Apri 20. 
Royat Socrety, at 4.30.—The Transmission of Infra-red Rays by the 
Media of the Eye, the Transmission of Radiant Energy by Crookes’s and 
other Glasses, and the Radiation from various Light Sources : H. Hartridge 
and A. V. Hill.—Surface Tension and Ferment Action: E. Beard and 
W. Cramer.—Surface Tension as a Factor controlling all Metabolism: 
W. Cramer. 
BORAL INSTITUTION, at 3.—Advances in General Physics: Prof. A. W. 
orter. 
InsTITUTION OF ELECTRICAL ENGINEERS, at 8.—The Bombay Hydro- 
Electric Scheme: A. Dickinson. 
ZooLocicat Society, at 4.—Anniversary Meeting. 
FRIDAY, Apri 30. 
Rovat InstiTuTION, at 9.—Emulsions and Emulsifications: Prof. F. G. 
Donnan. 
InsTITUTION OF PETROLEUM TECHNOLOGISTS, at 8.—Oil Well Engineer- 
ing: W. Calder. 
SATURDAY, May 1. 
Roya InstiTuTION, at 3-—Photo-Electricity : Prof. J. A. Fleming. 
MONDAY, May 3. 
Rova Society or Arts, at 8.—Foodstuffs : Dr. D. Sommerville. 
Vicroria InsTITUTE, at 4.30.—Mahayana Buddhism and Christianity : 
Rey. Dr. W. St. Clair Tisdall. 
ARISTOTELIAN Society, at 8.—Maine-de-Biran: Prof. A. Robinson. 
Society oF Cuemicat Inpustry, at 8. 
TUESDAY, May 4. 
Royat InstiTuTIoN, at 3.—The Animal Spirits : Prof. C. S. Sherrington. 
NO. 2374, VOL. 95] 


Rovat Society oF ARTS, at 4.30,—The Empire's Resources in Paper- 
making Materials : S. C. Phillips. 
WEDNESDAY. May +. 
Society or Pustic ANnatystTs, at 8.—Discussion : Methods adopted in 
the Estimation of the Nitrogenous Constituents of Extracts derived from 
Albuminous Substances, such as Meat Extracts and Similar Products, 
with Special Reference to the Interpretation of the Results. 
Roya Society or Arts, at 8.—lhe Measurement of the Efficiency of 
Domestic Fires, and on a Simple and Smokeless Grate: Dr. A. V. 
Harcourt. 
ENTomotocicat Society, at 8.—Descriptions of South-American Micro- 
Lepidoptera : E. Meyrick. —Experiments on Carnivorous Insects : C. F. M. 
ae Ee Larva and Pupa of Caligo memnon, Feld: F. L. 
avis. 
THURSDAY, May 6. 
Royat Society, at 4.30.—/?o0bable Papers: Some Problems Illustrating 
the Forms of Nebulz: G. W. Walker.—Observations on the Resonance 
Radiation of Sodium Vapour: Hon. R. J. Strutt.--Local Differences of 
Pressure near an Obstacle in Oscillating Water: Hertha Ayrton.— 
Measurement of the Specific Heat of Steam at Atmospheric Pressure and 
104°5°C. (with a Pretace by Prof. H. L. Callendar, F.R.S.): J. H. 
Brinkworth.—Thermal Properties of Carbonic Acid at Low Temperatures. 
II.: C. F. Jenkin and D. R. Pye. 
Rovat Institution, at 3.—Advances in General Physics: Prof. A. W- 
Porter. 
Roya Society or Arts, at 4.30.—Constantin Meunier et les Sculpteurs 
Belges de son Temps: M. Paul Lambotte. 
LINNEAN Society, at 5.—Some Bird Problems : W. Percival Westell.—The 
Brown Seaweeds of the Salt-marsh; LI.: Dr. Sarah M. Baker and Miss 
M. H. Bohling.—A Collection of Borneo Mosses made by the Rev. C. H. 
Binstead: H. N. Dixon.—Photographs of a Curiously-grown Tree from a 
Tunbridge Wells Garden: Rev. T. R. R. Stebbing. 
FRIDAY, May 7. 
Roya. INstTiITUTION, at 9.-—Electrons and Heat: Prof. O. W. Richardson. 
Geovosists' AssociaTIon, at 8.—Radio-activity and the Measurement of 
Geological Time : A. Holmes. 
SATURDAY, May 8. " 
Roya INSTITUTION, at 3.—Photo-Electricity : Prof. J. A, Fleming. 
CONTENTS. 
The Value of the Rarer Elements. 

PAGE 
By James H. 
Gardiners. %).. <3! 3 3eeme Se Salas eee aay 
Abnormal Psychology. By Dr. William Brown. . 227 
Pasteur and Preventive Medicine. By Prof, R. T. 
Hewlett oe ow a Mol ee DN BERS) 0 (ace To eames 
Electrical Engineering. By Prof. David Robertson 229 
Our Bookshelf . aes eet a rh et See 
Letters to the Editor:— 
The Nature of Gas Ions.—Prof. E. M. Wellisch 230 
Migrations in the Sea.—Prof. A.Meek. ... . 231 
A Mistaken Butterfly. —Prof. G. H. Bryan, F.R.S. 231 
The “Cracking’’ of Oils and its Commercial Use 231 
Servi Sevorum Dei. By Stephen Paget ..... 233 
The Use of Asphyxiants in Warfare. ...... 234 
Richardilydekker, “HoRsSss ie ean nee 
Dr Wi. J. Sell, F.RISt~ SAU eeneus eet ee 
Sl pe Sod SERS 6 as yoo BAe 
Our Astronomical Column :— 
Comet 19152 (Mellish)7-" 5 sheen] coc) ne eee 
Astronomy and’ the=War: is deen Seto he wentemnemecr 
Electric Furnace Spectra of Vanadium and Chromium 242 
Recent Papers in the ‘‘Astronomische Nachrichten” 242 
dihes <5 Gazette Astronomiqnes ann) a )s5 amend 
British Geology. (J//ustrated.) By G:A.J.C.... 242 
Experimental Botany at Trinity College, Dublin. . 244 
Engineering, Education, and Research. By Dr. 
W.. Cawthorne Unwin} FiRISS 2) 5 2 sen eee 
University and Educational Intelligence . . ... 248 
Societies and Academies) 2, aus sues) 5) o eeeneeaO 
Books Received es PR. ka 
Diary of Societies .. Oi CIS netnie. foes, &o ar aa eae eS 



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