474 
NATURE 
[June 24, 1975 

thermal conductivity of lead.—B. Bogitch : The super- 
ficial. deformations of steels tempered at moderate 
temperatures. A study of the corrugations produced 
on a surface of polished steel on cooling down suddenly 
from temperatures of 225° to 4oo° C.—Louis Gentil : 
The Middle and Upper Cretacian in western Haut 
Atlas, Moroceco.—D, Eginitis: Recent earthquakes at 
Leucade and Ithaca.—H. Colin: The distribution of 
invertine in the tissues of the beetroot at different 
periods in its growth.—F. Bordas: The sanitation of 
the camps and battlefields. Residual heavy tar oil, 
freed from napththalene and phenol, mixed with sodium 
resinate, forms a stable emulsion with water. This 
mixture is suggested as specially suitable for preven- 
tive treatment against flies.—J. Bergonié: The vibra- 
tions caused by an electromagnet worked with alter- 
nating current in non-magnetic bodies.—Th. Guilloz : 
The electric needle for the detection of projectiles in 
the human body. 

BOOKS RECEIVED. 
Course in Chemistry. By W. 
and W. E. Henderson. Pp. x+416. 
London: Ginn and Co.) 5s. 6d. 
Geographic Influences in Old Testament Master- 
pieces. By Prof. L. H. Wild. Pp. xili+182. (Bos- 
ton and London: Ginn and Co.) 4s. 6d. 
Reports from the Laboratory of the Royal College 
of Physicians, Edinburgh. Vol. xiii. Edited by Dr. 
} J. G. Brown and Dr. J. Ritchie. (Edinburgh: 
Oliver and Boyd.) 
Whitby Wild Flowers. By B. Reynolds. 
(Whitby: Horne and Sons.) ts. 
Educative Geography. By J. L. Haddon. Pp. 76. 
(London: G. W. Bacon and Co., Ltd.) 1s. net. 
Memoirs of the Indian Meteorological Department. 
Vol. xxi. Part x. Correlation in Seasonal Varia- 
tions of Weather. iv., Sunspots and Rainfall. By 
Dr. G. T. Walker. Pp. 17-59. (Simla: Government 
Central Branch Press.) 1.8 rupees. 
A Critical Revision of the Genus Eucalyptus. By 
J. H. Maiden. Vol. iii. Part 2. Pp. 23-44+4 plates. 
(Sydney : W. A. Gullick.) 2s. 6d. 
Field Book of American Trees and: Shrubs. By 
F. S. Mathews. Pp. xvii+465. (New York and 
London: G. P. Putnam’s-Sons.)  7s..6d. net. 
Genetic. Dheory of Reality. By Dr. J. M. Baldwin. 
Pp. xvii+335. (New York and London: G. P. Put- 
nam’s sons.) 7s. 6d. net. 
The Chemist’s Year Book. 
First McPherson 
(Boston and 
Pp. 60. 
Edited by F. W. Atack. 
2 vols. Pp. 914. (London and Manchester : Sherratt 
and Hughes.) 10s. 6d. net. 
The Investigation of Mind in Animals. By.E. M. 
Smith. Pp. xi+ 194. 
Press.) /4.gs../met. 
St. Bartholomew’s Hospital in Peace and War. By 
Dr. N. Moore. Pp. iv+56. (Cambridge: At the 
University Press.) 2s. net. 
A Report on Researches on Sprue in Ceylon, 1912-14. 
Pp. x+155. (Cambridge: At the University Press.) 
7s. 6d. net. 
A Map of the Western War Area. 
to the Rhine, 
(Cambridge : At the University 
From the Seine 
and from the Swiss Frontier to the 
Rhine Delta. With Contour Lines and Layered 
Colouring. Style B. Mounted in Sections, without 
Names. (Oxford: University Press.) 12s. 6d. net. 
Our British Snails. By Rev. Canon J. W. Horsley. 
Pp. 69. (London: S.P.C.K.) 1s. net. 
The Beothucks or Red pags 
Inhabitants of Newfoundland. 
Pp. xx+348+plates xxxvii. 
University Press.) 21s. net. 
The Evolution of the Potter’s Art. 
Pp. xx. (London: 
NO. 2382 
the Aboriginal 
Je: Howley. 
(ee iedee At the 
By T. Sheppard. 
A. Brown and Sons, Ltd.) 
VOL. 95] 

DIARY OF "SOCIETIES. 
' FRIDAY, June 25. 
Puysicat Society, at 5.—A Theory of the Electrical Resistance of Metals - 
Sir J. J. Thomson.—An Unbroken Alternating Current for Cable Tele- 
graphy: Lt.-Col. Squier. 
MONDAY, June 28.. 
Rovyat GrocrapPuicat Society, at 8.30.—The Map of Europe and the 
Near East, compiled by the Society for the General Staff: A. R. Hinks. 
FRIDAY, Jury 2. 
Grotoctsts’ AssociaTIoNn, at 8.—A Provisional Hypothesis to Explain the 
Occurrence of the Various Types of Fossil Man: Prof. A. Keith. 
SATURDAY, Jury 3. 
BRITISH PSYCHOLOGICAL Society, and the 
Minp AssociaTion, at 6.—Joint meeting. Mr. Bertrand Russell's 
Theory of Judgment: Prof. G. F. Stout, 
ARISTOTELIAN SOCIETY, 
MONDAY, Jury 5. 
ARISTOTELIAN Society, BritisH PsycHoLoGicat Society, and the 
Minp AssociaTIion, at 4.—Joint meeting. The Import of Propositions : 
Miss Constance Jones, Dr. Bernard Bosanquet, and Dr. F. C. S. Schiller. 

CONTENTS. 
Chemistry of Petroleum. By J.B. Gy. . 22. : 447 
Significance of Sexual Reproduction in Plants. . 447 
Case-Hardening. By Prof. H.C. H. Carpenter . . 448 
OurnpBooksbelf .< .., ..,....2) Geen ese mn enn eA Gl 
Letters to the Editor:— : 
The Mobilisation of Science.—Sir T. K. Rose. . . 450 
The Magnetic Storm and Solar Disturbance of June 17, 
1915.—Rev. A. L, Cortie, S.J. 450 
Man’s True Thermal Environment. mG, w. Grabham 451 
A Continuous Spectrum in the Ultra-Violet.—Prof. 
James Barnes 5 
The Names of Physical Units. —Albert Campbell: AT 
Training for Scientific Research.—Dr. T.S, Patterson 452 
Extinguishing Fires.—C. Carus-Wilson .... . 452 
The Synthetic Production of Nitric Acid. .... 452 
The Royal Dublin Society. ag cee ote ep rena ad 
Dr. J. W. Jenkinson... . Baars), So) Taek vam)» ASQ 
INGtesiess (- .: iy), “Sevan sy ow: ‘6 + Seiya panne et 457 
Our eteowomicall Column =~ = 
GometiNotes...:. +.) ieee geitene site Ak-ne- oh aes - 462 
Orbits of Eclipsing Binasied bons a ty oa OZ 
The Variation of Latitude during 1914 -o-1915 70. » «» 462 
The Society for Practical Astronomy. ..... . 462 
Aiming with the Rifle. (///ustrated.) By Edwin 
LOCOS eG 2 co Gg’ Gro at S Gon 3 462 
The South- Eastern Union o: Scientific Societies . 465 
Osmotic Pressure and the Properties of Solutions, 
PIS WOO SS 6 Go 466 
Electrons and Heat. By Prof, oO. W. Richardson, 
ARRES igi aahseha: a! a) sails Ch TOURS so 5 467 
University and Educational ‘Intelligence ede shay yi 
Societies and Academies 
BookstReceived . . ... Sees lo! oo einen 
Diarysotesocieties, . . -emememetnr i-inr 474 


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