
390 NATURE [JUNE 3, 1915 
ane D = - 5 sg Lubricating Oils for use in Forced Lubricating Systems for Steam 
L. E. Cox. F [9 ite Hat: (London ? Longmans and Turbines: Arnold Philip.—Vhe Application of Adobe.as a Material for 
Co.) 2s. net. the Construction of Buildings for the Manufacturing and Storing of 
Union of South Africa. Department of Agriculture. 
Report with Appendices for the Year, April 1, 1913, to 
March 31, 1914. Pp. 299. (Cape Town: Cape 
Times, Ltd.) 7s. 6d. 
Zrédla PodsSwiadomosci i jej Przejawy. By E. 
Abramowski. Pp. 207. (Warszawa: Drukarnia 
Polska.) 1.50 kop. 
Podstawy Naukowe Elektrotechniki Lacznie Z 
Zasadami Pomiarow, M. Pozaryski. Pp. x+415. 
(Warszawa: Gebethnera i. Wolffa.) 2.40 kop. 
Institut Psychologiezny W Warszawie.  Prace z 
Psychologii Doswiadczalnej. Edited by E. Abramow- 
skiego. Tom. -ii.. Pp. xii+362. (Warszawa: 
Gebethnera i. Wolffa.) 1.80 kop. 
Zagadnienia dotyczace gieometrji Elementarnej 
zebral i Ulozyl F. Enriques.. Tom. i. Pp. iv+331. 
(Warszawa: Gebethnera i. Wolffa.) 1.50 kop. 
Towarzystwo Naukowe Warszawskie. By E. Loth. 
Pp. v+71. 
kop. 
M. Faraday Dzieje Swiecy szest wykladéw popu- 
larnych W. Przekladzie Marji i. Stanislawa Kali- 
(Warszawa: Gebethnera i. Wolffa.) 75 
nowskich. (Warszawa: Gebethnera i. Wolffa.) 50 
kop. 
Biblioteka Matematyczno - Fizyczna. Serya ili. 
x. Teorya Liezb (Kurs Uniwersytecki). Dr. W. Sier- 
pinski. Pp. xiv+412. (Warszawa: Gebethnera i: 
Wolffa.) 1.80 kop. 
The Limitations of Science. By Prof. L. T. More. 
Pp. 268. (New York: H. Holt and Co.) 1.50 dollars 
net. 
Wisconsin Geological and Natural History Survey. 
Bulletin No. xxxiii. Scientific Series. No. 10. The 
Polyporacez of Wisconsin By J. J. Neuman. Pp. 
206+xxv plates. Bulletin No. xli. Economic Series. 
No. 18. A Study of Methods of Mine Valuation and 
Assessment, with Special Reference to the Zinc Mines 
of South-western Wisconsin. By W. J. Uglow. Pp. 
73. (Madison, Wis.) 
Surface Tension and Surface Energy and their In- 
fluence on Chemical Phenomena. Bye Dries: 
Willows and E. Hatschek. Pp. viii+80. (London: 
J. and A. Churchill.) 2s. 6d. net. 
Plant Breeding. By L. H. Bailey. New edition. 
Revised by Dr. A. W. Gilbert. Pp. xviii+474. (New 
York: The Macmillan Co.; London: Macmillan and 
Co., Ltd.) 8s. 6d. net. 
Royal Botanic Gardens, Kew. Hand-list of Tender 
Monocotyledons. excluding Orchidacez, cultivated in 
the Royal Botanic Gardens. Second edition. Pp. 241. 
(London : H.M.S.O.: Royal Gardens. Kew.) ts. 6d. 
The Book of the Fly. By G. H. Hardy. Pp. 124. 
(London: W. Heinemann.) 2s. 6d. net. 
DIARY OF SOCIETIES. 
THURSDAY, June 3. 
Rovav Soctety. at 4.30.—The Shapes of the Equipotential Surfaces in the 
Air near Long Buildings or Walls, and their Effect on the Measurement of 
Atmospheric Potential Gradients: Prof. C. H. Lees.—The Influence of 
Gases on the Emission of Electrons and Ions from Hot Metals: Prof. 
O. W. Richardson, —The Band Spectrum associated with Helium : yawe 
Nicholson.—Soil Protozoa and Soil Bacteria: E. T. Russell.—The 
Chromosome Cycle in Coccidia and Gregarines: C. Dobell and A. P. 
Jameson. 
Rovat InstiTuTIon. at 3.—Methods of presenting Character in Biography 
and Fiction: Wilfrid Ward. 
FRIDAY. June 4. 
Rovat Institution, at 9.—Radiations from Exploding Atoms : Sir E. 
Rutherford. 
Geotocists' AssociaTIon (at University College), at 8.—Lakes and their 
Origin, with Special Reference to Rock-basins: Prof. E. J. Garwood. 
MONDAY. Tvne 7. 
RovaL INSTITUTION, at 3.—Method of Presenting Character in Biography 
and Fiction: Wilfrid Ward. 
Society or CHemicat Inpustry, at 8.—A New Process for the Refining 
of Chile Saltpetre: J. B. Hobsbaum.—A Method of Testing Mineral 
NO 2379; VOL. 95] 

Explosives ; Major Ferriz. 
Vicrorta INsTITUTE, at 4.30.—The Old and New Versions ot the Baby- 
lonian Creation and Flood Stories: Dr. T. G. Pinches. 
ARISTOTELIAN Society, at 8.—Some Theories of Knowledge: Dr. F. 
Aveling. 
TUESDAY, June 8. 
Roya InstiTuTION, at 3.—The Evolution of Steel—Influence on Civilisa- 
tion: Prof. J. O. Arnold. 
ZOOLOGICAL Society, at 5.30.—The Feet and Glands and other External 
Characters of the Paradoxurine Genera Paradoxurus, Artictis, Arcto- 
galidia, and Nandinia: R. 1. Pocock.—The Skull of an Extinct Carnivore 
related to Aeluropus, from a Cavern in the Ruby Mines, Mogok, Burma: 
Dr. A. Smith Woodward.—The Early Development of the Heart and 
Anterior Vessels in Marsupials, with Special Reference to Perameles : Miss 
K. M. Parker.—The Triassic Stegocephalians, Brachyops, Bothricsps, 
and Lydekkerina, gen. nov. : Dr. R. Broom. 
WEDNESDAY, June 9. 
GEoLoaicat Society, at §8.—The Accessory Minerals of the Granitic Rocks 
of the English Lake District: R. H. Rastall and W. H. Wilcockson. 
THURSDAY, June 10. 
Roya InstiTuTION, at 3.—Method of Presenting Character in Biography 
and Fiction : Wilfrid Ward. 
Royat. GEOGRAPHICAL SOCIETY, at 5.—The History of the Gradual 
Development of the Groundwork of Geographical Science : Sir Clements 
Markham. 
INSTITUTE OF AcTUARIES,’at 5.—Annual General Meeting. 
FRIDAY, June 1i. ‘ 
Royat InstiTuTION, at 9.—Music and Poetry : Dr. H. W. Davies. 
Roya ASTRONOMICAL SOCIETY, at 5. 

CONTENTS. 
PAGE 
Germany and the Munitions of War. ..... . 365 
Explosives: Ancient and Modern ....... . 366 
Feeble-Mindedness 7 Tecate cash ie Re ROR 
Systematic Natural History. By Rev. T. R. R. 
Stebbing, F.R.S. . . irc, ee ee OE OMe ot Ga aiele: 
Our Bookshelf Mas Cove Reo Or aoe ED 
Letters to the Editor:— 
Ultra-Violet Excitation of the D Line of Sodium.— 
Hon. R. J. Strutt, F.R.S. Rat ek = ae70) 
On the Sealing of Electrical Conductors through Glass. 
—F. F. S. Bryson . Me Metay = ds; is caged ees ae! 
Eryonicus-Polycheles.—Oscar Sund. ..... .. 372 
The Age of the Earth.— Dr, F, A. Lindemann . . 372 
Modern Substitutes for Butter.—S. H. B.; ‘‘ The ; 
Writer of the Article” Sig tne? e's oh celeameeypies 
The Extincteur and its Limitations ......-. 373 
Research in Aerodynamics. (With Diagrams.) . . 375 
Dr. Hugo Miller, F.R.S.. . 376 
Notes 377 
Our Astronomical Column :— 
Observations of Nebulz at the Helwan Observatory . 381 
Stars with Proper Motion Exceeding 0°50” Annually . 381 
Orbits of Variable Radial Velocity Stars... .. . 382 
Manchester Astronomical Society . ....... . 382 
Constituents of Extracts Derived from Albuminous 
Substances an oe SR ee ea ee De 
Museums and Education.) oe eee 382 
Measurement of the Distances of the Stars. By 
Sirk. uv. Dy son, 'F. RoSi Sue weneerentoy ert ae : 
University and Educational Intelligence ..... 
Societresand7Aicademies 2a eee ce Chen 
Books Received - sy RRs istieiieg oes atiaeee 
Diary of Societies . . Mires Melee nce pea nd Ia 
Dr. M. W. Crofton, F.R.S. By Prof. S. B. Kelleher 377 
383 
387 
388 
389 
390 


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