XXXViil 
L[ndex 
Nature, 
October 7, 1915 

Peru, Explorations in, Dr. Hrdlitka, 275 
Petroleum, the Chemistry of, and its Substitutes, Drs. C. T. 
Tinkler and F. Challenger, 447 
Pharmaceutical Society Medals, award of, 207 
Pharmacodynamical Action of Gold, H. Busquet, 168 
Pharmacopceia : British, Squire’s Pocket Companion to the, 
P. W. Squire, second edition, 641; the Extra, Dr. 
W. H. Martindale and W. W. Westcott, two vols., 
sixteenth edition. 641 
Pharmaco-Therapy, on, and Preventive Inoculation, Sir 
A. E. Wright, 228 
Pheasants : and North Sea Battle, 43 ; Hybrid, White-collar 
Mendelising in, Mrs. R. Haig Thomas, 362 
Phelipea, the Genus, Dr. Stapf, 711 
Phenological Observations, J. E. Clark, 389 
Philippine : Islands, Mineral Resources of the, 333; Plants, 
E. D. Merrill, 546; Rubiacew, E. D. Merrill, 599 
Philosophy : What is it?, Prof. F. B. Jevons, 172 
Photochemical Reactions, Temperature-coefficient of, D. 
Berthelot, 195 
Photographic: Effect of Recoil Atoms, A. B. Wood and 
A. I. Steven, 25; Process, Physics of the, Dr. C. E. K. 
Mees, 72 
Photographs of the Milky Way and of Comets, by Prof. 
E. E. Barnard, 48s 
Photomicrography, Booklet on, 273 
Photography, Three-Colour, by A. F. von. Hiibl, Translated 
by H. O. Klein, 641 
Phototropy of: Inorganic Systems, J. R. Mourelo, 721 
Physical: Anthropology, 115; Chemical, and Engineering 
Constants, Dr. J. A. Harker, 475; Constants, Dr. J. A. 
Harker, 281; Units, the Names of, Dr. C. E. Guil- 
laume, Dr. J. A. Harker, 427; A. Campbell, 451; 
Dr. Norman R. Campbell, 480 
Physics, Applied, Outlines of, H. Stanley, 257; General, a 
Text-book of, for College Students, Dr. J. A. Culler, 
423; Manuals of, 423; Practical, Notes on, for Junior 
Students, Prof. C. G. Barkla and Dr. G. A. Carse, 423; 
Practical, Preliminary, A. E. Lyster, part ii., Heat, 
257; Text-books of, 257 
Physiographic Features as a Factor in the European War, 
Prof. D. W. Johnson, 443 
Physiology of “ Walking,” Dr. T. G. Brown, 26 
Physique: Cours de, Prof. E. Rothé, 257; Traité de, Prof. 
O. D. Chwolson, Translated by E. Davaux, 257 
Piano-Players, Some Scientific Aspects of, Prof. G. H. 
Bryan, 131 
Piantication, Dr. A. R. Friel, 380 
Picea and Abies, New Species and Varieties of, 
Shirasawa, 681 
Pictures in the Land of Temples, Joseph Pennell’s, 394 
Pigeons: Inheritance in, Drs. Cole and Kirkpatrick, 553 ; 
Sex Ratios of, Drs. Cole and Kirlpatrick, 658 
Pigments, Reflective Power of, C. Cochrane, 195 
Pilgrim’s Scrip, a, R. Campbell Thompson, 285 
Piltdown Skull, the, M. Boule, 460 
“Pinacoid,” the Use of the Term, in Crystallography, Prof. 
G. A. J. Cole, 318 
Pine Martens, a Litter of, in the Lake District, 460 
Pines, European, 711 
Pittsburgh, a Laboratory 
692 
Pitwood, Supply of, Sir W. Schlich and others, 176 
Plane-Kite, Motion of a, Prof. J. M. Bose, 682 
Plankton Animals, the Rearing of, L. R. Crawshay, 629 
Plant-association at the Foot of the Boium Glacier, H. W. 
Monckton, 471 
Plant-breeding, Fundamentals of, Dr. J. M. Coulter, 478 
Plant: Collector, a Great, 311; Growths, Periodicity in, 
Mrs. R. Jones, 26; Life in Iceland and Cyprus, 254; in 
South Africa and California, 698; the Story of, in the 
British Isles, Types of the Natural Orders, vol. ii., 
vol. iii., A. R. Horwood, 421; Pathology, G. Massee, 
681; Physiology Practical, 391; Poisons, Inorganic, and 
Stimulants, Dr. W. E. Brenchley, 314; of South 
African Plants, C. F. Juritz, 15 
Plants: and their Ways in South Africa, Prof. B. Stone- 
man, new edition, 698; collected in Southern Rhodesia, 
F. Eyles, 582; in the Percy Sladen Memorial Expedi- 
tions in South-West Africa, Prof. Pearson, 351; Fossil, 
Prof. 
of Occupational Diseases at, 


from North Devon, Dr. Arber and R. H. Goods, 55; 
Jurassic, from Yorkshire, H. H. Thomas, 55; New 
Varieties of, the production of, 478; of Late Glacial 
Deposits, C. Reid, 111; Sex-limited Inheritance in, 
G. H. Shull, 159 
Plateau Peoples of South America, the, A. A. Adams, 
284 
Platinum, Tetravelent, Compounds of, L. ischugaeff and 
N. Wladimiroff, 529 
Pleiades, Relative Proper Motions of the, Dr. R. Triimpler, 
126 
Pleistocene Southern Elephant, Discovery of a Skeleton of 
the, at Upnor, 544 
Pliocene Man, Clement Reid and others, 303 
Plough, Evolution of the, A. S. F. Gow, 14 
Plumage in some British Ducks, Miss A. C. Jackson, 
5 
Plymouth, Marine Biology at, 629 
Poison War, the, A. A. Roberts, 560 
Poisoned Bait in Controlling House-flies, C. W. Mally, 
phir sede Gas, Defence against, Dr. F. C. Coley, 349; 
Gases in Warfare and their Antidotes, Sir W. A. 
Tilden, 395 
Pollen, the Physiology of, Y. Tokugawa, 599 
Pollution of the Air, 381 
Polymorphism, Isomerism, and Polymerism, H. V. Sidg- 
wick, 519 
Polyplax, New Species of, B. F. Cummings, 167 
Polyporaceze of Wisconsin, the, J. IT. Neuman, 570 
Porphyry, Types of, in Finland, H. Hausen, 239 
Port of London Docks and Traffic, 712 
Potamogetons (Pond Weeds), the, of the British Isles, A. 
Fryer and A. Bennett, 531 
Potash Salts: Examination of, Dr. W. A. K. Christie, 98 ; 
from Woodlands, G. P. Gordon, 177 
Potassium: Permanganate, Reduction of, by Oxalic Acid, 
A. Boutaric, 417; and Rubidium, and Radio-activity, 
Dr. H. Lachs, 712 
Potter’s Art, the Evolution of the, T. Sheppard, €72 
Pottery : for Artists, Craftsmen, and Teachers, G. J. Cox, 
202; from the Mimbres Valley, Dr. J. W. Fewkes, 
213 
Pourtales’s Haliotis, J. B. Henderson, 
I 
Picea Science: and Mathematics, E. J. Edwards and 
M. J. Tickle, 586; Preliminary, H. Stanley, 257 
Precision Resistance Measurements, E. H. Rayner, 388 
Pre-Glacial Wave-cut Platform at Milford Haven, Dr. A. 
Strahan, 242 
Prehistoric: Cave Paintings at Raigarh, P. Brown, 307; 
Cultural Centres in the West Indies, 598 
Pressure, Local Differences. of, in Oscillating Water, 
Hertha Ayrton, 305 
Pretoria Meeting of the South African Association, 684 
Preventive and Curative Medicine, Reputed New Remedies, 
680 
Prickly Pear Problem in Australia, Dr. C. F. Juritz, 352 
Prime Numbers: and the Complex Variable, 254; from 
1 to 10,006,721, List of, D. N. Lehmer, 254 
Princeton University, Gifts to, 278 
Printing Inks, Composition, Properties, and Testing of, 
04 
Prismatic Spectra: Law of Dispersion of, M. Salet, 417; 
Reduction Formula for, M. Hamy, 417 
Problems of Science, Prof. F. Enriques, 
K. Royce, 639 
Production, First Principles of, J. T. Peddie, 428 
Professional Classes War Relief Council, Report of the, 
499 y 
Projection Screen Invented by T. Thorp, Prof. W. W. H. 
Gee, 139 - 
Propulsion, Theory of, F. W. Lanchester, 131 
Protozoa, Heredity in, Dr. M. H. Jacobs, 443 
Psychologie, Objektive, oder Psychoreflexologie, Prof. W. 
von’ Bechterew, 142 
Psychology: Abnormal, Dr. W. Brown, 227; and Indus- 
trial Efficiency, Prof. H..Miinsterberg, 142; and Phil- 
osophy, 172; without Consciousness, A. E. Crawley, 
85 
Re-discovery of, 
translated by 
