720 



NATURE 



[February 25, 1915 



Journal Kept by David Douglas during his Travels 

 in North America, 1823-1827, etc., with appendices 

 containing a List of the Plants introduced by Douglas, 

 and an account of his death in 1834. Pp. 364. (Lon- 

 don : W. Wesley and Son.) 215. net. 



Summary Report of the Geological Survey, Depart- 

 ment of Mines, for the Calendar Year 1913. Pp. 417. 

 (Ottawa : J. de L. Tache.) 



Icones of the Plants of Formosa, and Materials for 

 a Flora of the Island. By B. Hayata. Vol. Iv. Pp. 

 vi + 264 + plates xxxv. (Taihoku : Government of 

 Formosa.) 



British Museum (Natural History). British Ant- 

 arctic {Terra Nova) Expedition, 1910. Natural History 

 Report. Zoology, vol. ii., No. 2, Oligochaeta. By 

 H. A. Baylis. Pp. 13-18. Zoology, vol. ii., No. 3, 

 Parasitic Worms, with a Note on a Free-living 

 Nematode. By Dr. R. T. Leiper and Surgeon E. L. 

 Atkinson. Pp. 19-60. (London : British Museum 

 (Natural History); Longmans and Co.) is. and is. 6d. 

 respectively. 



The Chemistry of Colloids and some Technical 

 Applications. By Dr. W. W. Taylor. Pp. viii + 328. 

 (London : E. Arnold.) ys. 6d. net. 



Forest Valuation. By Prof. H. H. Chapman. Pp. 

 xvi + 310. (New York: J. Wiley and Sons, Inc.; 

 London : Chapman and Hall, Ltd.) 8s. 6d. net. 



X rays and Crystal Structure. By Prof. W. H. 

 Bragg and W. L. Bragg. Pp. vii + 228. (London: 

 G. Bell and Sons, Ltd.) ys. 6d. net. 



DIARY OF SOCIETIES. 



THURSDAY, February 25. 



Royal Society, at 4.30.— The Effect of the Depth of Pulmonary Ventila- 

 tion on the Oxygen in the Venous Blood of Man : Prof. L. Hill and 

 J. F. Twort. — The F.ffect of Functional Activity upon the Metabolism, 

 Blood Flow and Exudation in Organs : J. Barcroft and Toyojiro Kafo — 

 The Osmotic Balance of Skeletal Muscle : Miss D. Jordan Lloyd and 

 W. B. Hardy.— The Function of Chlorophyll : Dr. A. J. Ewart.— Con- 

 tributions to the Study of the Bionomics and Reproductive Processes of 

 the Foraminifera : E. Heron-Allen. — The Influence of the Hydrogen 

 Concentration upon the Optimum Temperature of a Ferment : A. 

 Compton. 



Royal Institution, at 3. — Struggle of Vations : Dr. P. Chalmers Mitchell. 



Child Study Society, at 6. — Discussion : The Care and Development of 

 the Child— from Ante-Natal Period to Five Years of Age. Ante- Natal 

 Period : Dr. G. Rric Pritchard ; Infancy : Miss J. Halford ; One to Five 

 Years : Dr. D. Forsyth. 



Institution ok Electrical Engineers, at 8. — Electricity applied to 

 Mining : C. P. Sparks. 



FRIDAY, February 26. 



Royal Institution, at 9.— Solar Eclipse"of 1914 : The Rev. A. L. Corti*:. 



Physical Society, at 5.— Magnetic "Character" Figures. Antarctic and 

 International : Dr. C. Chree— The Electrification of Surfaces as Affected 

 by Heat : Dr. P. E. Shaw. — Electromagnetic Inertia and Atomic Weight : 

 Prof. J. W. Nicholson. 



SATURDAY, February 27, 



Royal Institution, at 3. — Recent Researches on Atoms and Ions : Sir 



J. J. Thomson. 

 Essex Field Club (at the Essex Museum, Stratford), at 6.— Incisor-teeth 



of Rhinoceros : E. T. Newton.— Palaeoliihic Implements and Plant Seeds 



from the River Gravel at Hackney Wick in the Lea Valley : A. Wrigley. 



— The New Witches-Broom on the Crack Willow : Miller Christy. — East 



Anglian Gravels: W. H. Dalton. 



MONDAY, March i. 

 Society of Chemical Industry, .it K. 

 Aristotelian Society, at 8.— The .(Esthetic of Benedetto Croce : A. A. 



Cock. 

 Victoria Institute, at 4.30.— 1 he Spectra of Stars and Nebulse : Prof. 



A. Fowler. 

 Royal Society of Arts, at 8.— Motor Fuels : Prof. Vivian B. Lewes. 

 Society of Engineers, at 7.30.— Running Costs of Motor Vehicles : Lieut. 



R. W. A. Brewer. 



TUESDAY, March 2. 



Royal Institution, at 3. — Photographic Appreciation of Colour in Mono- 

 chrome : Prof. W. J. Pope. 



Royal Society of Arts, at 4.30. — The Northern Territory of Australia : 

 Past, Present, and Future : D. Lindsay. 



RoNTGEN Society, at 8.15.— The Chemistry of the Radio Elements: A. 

 Fleck. 



WEDNESDAY. March 3. 



Society of Public Analysts, at 8. — The Soluble Chlorides and Total 

 Chlorme in some English Cokes ; S. W. Bridge. — The Routine Detection 

 and Estimation of Boric Acid in Butler : H. Hawley. — 1 he Structure 

 of Pepper — Some New Features : T. E. Wallis. — The Occurrence of 

 Chlorine in Coal : A. de Waele. 



Institution of Electrical Engineers (Students' Section), at 7.45.— 

 The Application of Electrical Engineering to Warfare— Communications, 

 Wireless, etc. : P. R. Coursey ; The Laying and Firing of Mines : S. G. 

 Killingback ; Searchlights and Projectors : E. L. M. Etniage. 



Royal Society of Arts, at 4.30. — Shakespeare's Profession: W. Poel. 



Entomological Society, at 8. 



THURSDAY. March 4. 



Royal Society, at 4.30. — Probable Paters : A Bolometric Method of 

 Determining thejEfficiency of Radiating Bodie< : Prof. W. A.' Bone, Prof. 

 H. L. Callendar, and H. J. Yates.— The Simplification of the Arithmetical 

 Processes of Involution and Evolution: E. Chappell. — The Elastic Pro- 

 perties of Steel at Moderately High Temperatures : F. E. Rowett. 



Royal Institution, 313. — Poetry and War : Sir Herbert Warren. 



Royal Geographical Society, at 5.— Suess's Classification of the 

 Eurasian Mountains : Prof. J. W. Gregory. 



FRIDAY, March 5. 

 Royal Institution, at 9. — Mimicry and Butterflies: Prof. E. B. Pou'ton. 

 Geologists' Association, at 8.— Geology of the Glasgow District : ProC 

 J. W. Gregory. 



SATURDAY, March 6. 

 Royal Institution, at 3. — Recent Researches on Atoms and Ions : Sir 

 J. J. Thomson. 



CONTENTS. PAGE 



Roman Birds and American Poets. By Rev. T. F. 



Royds 693 



Factory Economics 694 



Cacao and Cocoa-Nuts. By Dr. S. E. Chandler . . 695 



Man and the Universe. By C, S 696 



Our Bookshelf 697 



Letters to the Editor :— 



Measurements of Medieval English Femora. — Prof. 



Karl Pearson. F.R.S 698 



A Remarkable Dry Fog in the East Indian Archi- 

 pelago.— Dr. C. Braak 699 



A Penalty on Research.— Hon. H. Onslow; 



Arnold T. Watson 699 



Cement for Polarimeter Tubes. —Dr. T. S. Patterson 700 



The Prices of Chemicals.— S. P 700 



The Manufacture of Dyestufifs. By Prot Walter M. 



Gardner 7oo 



On Colour Sensitised Plates.— II. {Illustrated.) By 



Chapman Jones 7°' 



Prof. G. F. J. Arthur Auwers. By W. E, P 703 



Notes 704 



Our Astronomical Column :— 



Comet News 7o8 



Magnitude Error in Parallax Determinations .... 709 



Radiometric Measurements of no Stars 7^9 



Determination of Time 7^9 



The Sea Fisheries and the War. (With Diagram.) 



By J. J • • 709 



Meteorological Charts for the Mediterranean. By 



E. G 710 



Lord Kelvin's Work on Gyrostatics. {Illustrated.) 



By Prof. A. Gray, F.R.S 7" 



University and Educational Intelligence 716 



Societies and Academies 7i7 



Books Received 7^9 



Diary of Societies 720 



Editorial and Publishing Offices: 



MACMILLAN & CO., Ltd., 



ST. MARTIN'S STREET, LONDON. W.C. 



Advertisements and business letters to be addressed to the 



Publishers. 



Editorial Communications to the Editor. 



NO. 2365, VOL. 94] 



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 Telegraphic Address: Phusis, London. 



