84 NATURE 

The Counties of Clackmannan and Kinross. By 
J. P. Day. Pp. viiit+145. (Cambridge: At the Uni- 
versity Press.) 1s. 6d. net. 
The Teaching of Geography. By B. C. Wallis. 
Pp. viiit+221. (Cambridge: At the University Press.) 
3S. (6d. net. 
Molecular Association. 
Pp. viii+17o. 
net. 
Ancient Hunters and their Modern Representatives. 
By Prof. W. J. Sollas. Second edition. Pp. xxiii+ 
591. (London: Macmillan and Co., Ltd.) 15s. net. 
Sun Lore of All Ages. By W. T. Olcott. Pp. xiii+ 
346. (New York and London: G. P. Putnam’s Sons.) 
ros. 6d. net. 
English Folk-Song and Dance. 
M. Neal. Pp. vii+178. 
sity Press.) 3s. net. 
German Culture : The Contribution of the Germans 
to Knowledge, Literature, Art, and Life. Edited by 
Prof. W. P. Paterson. Pp. x+384. (London and 
Edinburgh: T. C. and E. C. Jack.) 2s. 6d. net. 

By Dr. W. E. S. Turner. 
(London: Longmans and Co.) 5s. 
By F. Kidson and 
(Cambridge : At the Univer- 

DIARY OF SOCIETIES. 
THURSDAY, Marcu 18. 
Royvat Society, at 4.30.—Bakerian Lecture: X-rays and Crystals: Prof. 
W. H. Bragg. 
Roya [Nnsti7uTION, at 3.—The Form and Structure of the London Basin : 
Dr. A, Strahan. 
Roya Society oF ARTS, at 4.30.—The Indian Army: Lieut.-Colonel 
A. C. Yate. 
INsTITUTION OF MINING AND METALLURGY, at 8.—Annual General 
Meeting—Presidential Address: Sir Thomas Kirke Rose. 
LInNEAN Society, at s.—Hollow-shafted Feathers: W. M. Webb.—The 
Lichens of South Lancashire : J. A. Wheldonand W. G. ‘Travis.—Coloured 
Drawings and Lantern Slides of 36 British Orchids: E. J, Beaford.—A 
Few Australian Plants: Dr. A. B. Rendle. 
INSTITUTION OF PETROLEUM TECHNOLOGISTS, at 8.—The Internal Com- 
bustion Engine on the Oilfield: F. G. Rappoport. 
InsTITUTE OF MerALs, at 3.—A selection of the following papers :—Some 
Experiments upon Copper-Aluminium Alloys: J. H. Andrew.—The 
Constitution of the Alloys of Copper with Tin. Parts J. and II. : Tights 
Haughton.—Etching Re-Agents and Their Applications: O. F. Hudson. 
—The Effects of Heat and of Work on the Mechanical Properties of 
Metals: Prof. A. K. Huntington.—The Quantitative Effect of Rapid 
Cooling upon the Constitution of Binary Alloys. Part III. (Conclusion): 
Dr. G. H. Gulliver.—\he Properties of Some Nickel-Aluminium and 
Copper-Nickel-Aluminium Alloys: Prof. A. A. Read and R. H. Greaves. 
—Some Appliances for Metallograpbic Research: Dr. W. Rosenhain. — 
The Micro-Chemistry of Corrosion. Part III]. The Alloys of Copper and 
Zinc : S. White. 
FRIDAY, Marcu io. 
Royat Institution, at 9.—The Modern Piano Player—Scientific Aspects : 
Prof. G. H. Bryan. 
INSTITUTION OF MECHANICAL ENGINEERS, at 8.—The Chemical and 
Mechanical Relations of Iron, Cobalt, and Carbon: Prof. J. O. Arnold 
and Prof. A. A. Read. 
INsTITUTE OF METALS, at 10.30 a.m. and 3 p.m.—A Selection of the 
Papers enumerated above. 
SATURDAY, Marcu 20. 
Rovat Instirution, at 3.—Recent Researches on Atoms and Jons: Sir J. J. 
Thomson. 
MONDAY, Marcu 22. 
Rovav Society oF Arts, at 8.—House Building : M. H. Baillie Scott. 
ee GEOGRAPHICAL SOCIETY, at 8.30.—Spitsbergen in 1914: Dr. W. S. 
ruce. 
TUESDAY, Marcu 23. 
Roya. Institution, at 3.—The Belief in Immortality among the Poly- 
nesians: Sir J. G. Frazer. 
ZooLocicat Society, at 5.30.—Exhibition of Partridges and other Game 
Birds : W. R. Ogilvie-Grant.—Contributions to the Anatomy and Syste- 
matic Arrangement of the Cestoidea.—XVI. On Certain Points in the 
Anatomy of the Genus Amadilia and of Dasyurotaenia. Dr. ¥. E. 
Beddard.—The True Coracoid: R. Lydekker.—The Artificial Formation 
from Paraffin Wax of Structures resembling Molluscan Shells: J. ‘I. 
Cunningham.—On ‘I'wo new Species of Polyflax (Anoplura) from Egypt : 
Bruce F, Cummings. 
INsTITUTION OF CiviL ENGINEERS,:at 8.—Déscussion : The Improvement 
of the River Clyde and Harbour of Glasgow, 1873-1914: Sir Thomas 
Mason.—Probable Paper: On Impact Coefficients for Railway Girders : 
C. W. Anderson. 
WEDNESDAY, Marcu 24. 
RovaL Society oF ArTS, at 5.30.—The Work of the War Refugees’ 
Committee : Lady Lugard. 
InstituTION OF Navat ARcHITECTS, at 11 ‘a.m.—The Watertight Sub- 
division of Ships: Prof. J. J. Welch.—The Increase of Safety Afforded by 
a Watertight Deck: K. G. Finlay.—At 3 p.m.—The Influence of Dis- 
charging Appliances on the Design of Large Ore-Carriers: J. Reid.— 
The Scantlings of Light Superstructures: J. Montgomerie. —On the 
Strength and Spacing of Transverse Frames : C, F. Holt 
NO, 2368, VOL. 95] 



[Marcu 18, 1915 
GeoLocicat Society, -at 8.—The Stratigraphy and Petrology of the 
Lower Eocene Beds of the North-Eastern Part of the London Basin = 
P. G. H. Boswell. 
THURSDAY, Marcu 25. 
Roya Society, at 4.30.—Probable Papers: On Forms of Growth resem- 
bling Living Organisms and their Products slowly deposited from Meta- 
stable Solutions of Inorganic Colloids : Prof. #. Moore and W. G. Evans. 
—The Production of Growths or Deposits in Meta-stable Inorganic 
Hydrosols: Prof. Moore.—A Contribution to our Knowledge of the 
Chemistry of Coat-Colour in Animals and of Dominant and recessive 
Whiteness: H. Onslow. 
Roya. InstiTuTION, at 3.—The Ground beneath London ; Dr. A. Strahan. 
Cuitp Stupy Society, at 6.—The Care of the Teeth: C. E. Wallis. ¥ 
INsTITUTION OF ELEcTRICAL ENGINEERS, at 8.—Telephone Troubles in 
the Tropics: W..L. Preece, wre 
INSTITUTION OF NavAL ARCHITECTS, at 11 a.m.—A Contribution to the 
Theory of Propulsion and the Screw Propeller: F. W. Lanchester.— 
A Comparision between the Results of Propeller Experiments in Air and 
Water : A. W. Johns.—Further Model Experiments on the Resistance of 
Mercantile Ship Forms: The Influence of Length and Prismatic 
Coefficients on the Resistance of Ships: J. L. Kent —At 3 p.m.—The 
Law of Fatigue Applied to Crankshaft Failures: C. E. Stromeyer.— 
The Effect of Beam on the Speed of Hydro-Aeroplanes: L. Hope.— 
Notes on the Cross Curves and GZ Curves of Stability : E. F. Spanner. 
FRIDAY, Marcu 26. 
Rovat InstITUTION, at 9.—Experiments in Slow Kathode Rays: Sir 
J. J. Thomson. 
Geo.oeists’ AssociaTION, at 8.—On the Structure of the Eastern Part of 
the Lake District: J. F. N. Green. 
SATURDAY, Marcu 27. 
Rovat InstITUTION, at 3.—Recent Researches on Atoms and Jons: Sir 
J. J. Thomson. 

CONTENTS. 
Sciencesand Industry 42 thot) eee eae 
The Chemistry of Food Products. By E. F. A. .. 59 
Applied Botany . : chp sesh a «(4 shxaigh ol lNenils eaten COs 
Lantern- and Micro-Projection ......... 
Mathematical! Works: <i2) sees se) en Oe 
Our Bookshelf tea toe se fk Meese? ON for %e ys ae aS 
Letters to the Editor :-— 
Supposed Horn-Sheaths of an Okapi.—Sir E. Ray 
Lankester, K.C.B., F.R.S. . af ta a Sas Oe 
The Spectra of Hydrogen and Helium.—T, R. 
Merton Jes) a1, bo Pe rnc cfg. (as 
Musical Sand in China.—Joseph Offord aa 
The Green Flash.—Prof. W. Geoffrey Duffield . 66 
Measurements of Medieval English Femora.—Prof, 
Karl Pearson, F..RiSi jem en s. ee 
The Principle of Similitude. By Lord Rayleigh, 
(OF) Gao igs ti oe Get OC jue bo 
Periscopes. (With Diagrams.) By S. D. Chalmers . 68 
Oil of Vitriol as an Agent of ‘‘Culture.” By T.. . 69 
Prof. H. W. Lloyd Tanner, F-R.S. By R. H. P.. . 7o 
Notesiee * cscueaan Ber CU PR FF! 
Our Astronomical Column :— 
Mellish’s'\Comet. (1915) = men gee nenie- ion 1) 2) ey 
Sun-spot and Magnetic Activityin 1913 ...... 75 
Report of Mount Wilson Solar Observatory ae 
Annuaire Astronomique et Meétéorologique pour 1915 76 
The Avezzano Earthquake of January 13. (With 
Map.) By Dr. Charles Davison. ......... 76 
By: Jee SaVWictSs fics: ono, onion] 
Ornithological Notes:, /BysRoee es. ee eee: 
INotesvon: iGlassi.; i; 5. 5 isfepentieieeesm se) led ee eT 
University and Educational Intelligence. ..... 80 
Societiesiand! Academiesi-)y sensei cre 
Books Received’ °-.. 5. cy caemeeents io lc ema 
Diary vofesocieties). 4.0) aie. 
Sanitation in India. 


Editorial and Publishing Offices : 
MACMILLAN & CO., Ltp., 
ST. MARTIN’S STREET, LONDON, W.C. 
Advertisements and business letters to be addressed to the 
Publishers. 
Editorial Communications to the Editor. . 
Telegraphic Address: PHusis, LONDON. 
Telephone Number: GERRARD 8830. 
