834 
Pickarp (R. H.) and J. Kenyon, 
optical rotatory powers and dis- 
persions of the members of some new 
homologous series, 429. 
*Pierines, the classification of the, by 
Sir G. Kenrick, 514. 
Pillow lavas in North and South Wales, 
various occurrences of, Dr. A. H. Cox 
and Prof. O. T. Jones on, 495. 
Pin-cushion starfish (Porania pulvillus, 
O.F.M.), the larva of the, by Dr. 
J. F. Gemmill, 511. 
Pinna-trace in the filicales, the, by R. C. 
Davie, 709. 
*Plane, a certain division of the, Prof. 
A. C. Dixon on, 399. 
Plant distribution, the influence of river 
development on, by A. R. Horwood, 
719. 
Plant enzymes, the study of, particularly 
with relation to oxidation, second report 
on, 143. 
Plant extermination, the control of, 
scientific societies and, by A. R. 
Horwood, 335. 
Plant petrifactions in chert and their 
bearing on the origin of fresh-water 
cherts, by Dr. Marie C. Slopes, 486. 
Prummer (W. E.) on seismological in- 
vestigations, 45. 
Plymouth marine laboratory, report on the 
occupation of a table at the, 155. 
Polarising apparatus, large, the con- 
struction of, by Prof. E.G. Coker, 389. 
Polytrichum, the leptoids in, the histology 
of, by Margaret Hume, 708. 
Porter (Prof. A. W.) on colour vision 
and colour blindness, 258. 
Povu.ton (Prof. E. B.) on zoology organi- 
sation, 154. 
on acquiring and arranging collections 
illustrating the natural history, &c., of 
the Isle of Wight, 155. 
on Mr. W. A. Lamborn’s observation 
on marriage by capture by a West 
African wasp, 511. 
mimicry, 518. 
mimicry between the genera of 
certain African nymphaline butterflies, 
519. 
the term mutation, 519. 
Povtton (Miss E. M.), the structure and 
life-history of Verrucaria margaracea, 
an aquatic lichen, 714. 
Powe tt (J. H.), hook-swinging in India, 
633. 
*PoynTING (Prof. J. H.), the twisting of 
India-rubber, 402. 
PREECE (Sir W. H.) on practical electrical 
standards, 133. 
on gaseous explosions, 166. 
Prehistoric horse remains in the Stort 
Valley, &c., by Rev. Dr. A. Irving, 650. 
INDEX, 
Prehistoric site at Bishop's Stortford, a, 
report on the excavation on, 236. 
Prices and the cost of living, discussion 
on, 578. 
*PRIDEAUX (Dr.), the hydrogen ion 
concentration of the sea and the 
alkali carbon dioxide equilibrium, 449. 
Primates, the phylogeny of the, by 
Dr. W. K. Gregory, 529. 
Prince Charles Foreland, Spitsbergen, 
completion of the map of, by Dr. 
W.S. Bruce, 546. 
Principal triangulation, the accuracy of 
the, by Capt. Winterbotham, 553. 
PRINGSHEIM (Prof. E.) on radiation, 383. 
a theory of luminescence and the 
relation between luminescence and 
pure temperature radiation, 389. 
Probability and entropy, the relation 
between, by Prof. H. A. Lorentz, 374. 
‘Protected’ insects, the enemies of, 
with special reference to Acrea zetes, 
by Dr. G. D. H. Carpenter, 516. 
Protozoa of soil, the, 'T. Goodey on, 775. 
Protura, the order, the systematic 
position of, R. 8. Bagnall on, 531. 
Pseudacreas and their acrzine models 
on Bugalla Island, Sesse, Lake Victoria, 
by Dr. G. D. H. Carpenter, 517. 
Psycho-analysis, by Dr. W. Brown, 688. 
Psychological analysis and educational 
method in spelling, by Miss 8. 8. 
Fairhurst, 302. 
*Psychological foundation of economics, 
the, by Rev. P. H. Wicksteed, 688. 4 
Psycho-physiological parallelism, the 
theory of, by Dr. H. Wildon Carr, 676. 
Punnett (Prof. R. C.) on experiments in 
inheritance, 155. 
Radial motion in sun-spots, by C. E. St. 
John, 392. 
Radiation, discussion on, 376. 
J. H. Jeans on, 376, 384, 385. 
Prof. Lorentz on, 381, 385. 
Prof. E. Pringsheim on, 383. 
Prof. A. E. H. Love on, 383. 
Sir J. Larmor on, 385. 
Radio-active elements and the periodic 
law, discussion on, 445. 
Radio-elements, the, and the periodic 
law, by F. Soddy, 445. 
the chemistry of, by Alex. Fleck, 
447. 
as indicators in chemistry and 
physics, by Dr. G. von Hevesy, 448. 
Radiotelegraphic investigations, report on, 
131. 
Radiotelegraphy, the nature of the 
electro-magnetic waves employed in, 
and the mode of their propagation, by 
Prof. G. W. O. Howe, 607. 
