587 
INDEX. 
Permian rocks of Skillaw Clough, by ; Pursuitmeter, new type of, by Prof. 
Miss M. Workman, 443, 504 (C 10). | BK. P. Cathcart, *484. 
Phase and pitch in localisation of tones, 
relation of, by H. Banister, 
(J 9). 
Photo-electric changes in green and | 
white leaves, 488, 507 (KK 13). 
Photo-electric current in green leaves, 
conditions which determine direction 
of, by J. C. Waller, 480, 506 (I 19). 
Photographs of geological interest, 
Report of Committee on, 307. 
Piercy (W.), Relations of psychology 
and economics, *483. 
Plankton in relation to food of the 
herring, by A. C. Hardy, 449, 504 
(D 10). 
Plankton organisms, exhibit of slides, 
by H. C. Chadwick, 450. 
Plankton organisms, feeding of some, 
by Dr. M. Lebour, 449, 504 (D 9). 
eon, rhythmic change in, by Prof. 
J. Johnstone, 448. 
Plurality of soils in Egypt 25, BY 
Capt. L. W. G. Misieidient *474, 
Polarised light, biochemical effect of, 
by Miss E. S. Semmens, 436, 504 
(B 15). 
Polychaet tubes, on two remarkable, 
by Prof. W. C. McIntosh, 455. 
Population and wnemployment, by Sir 
W. H. Beveridge, 138. 
Post-naupliar development of an 
estherid crustacean, by H. Graham 
Cannon, 453, 504 (D 25). 
Post-war wages problems, by Prof. H. 
Clay, 460, 505 (F 3). 
Ports (Dr. W. A.), on the delinquent 
child, 498. 
Poutton (Prof. E. B.), 
undersurface of wings 
butterflies, 447, 504 (D 2). 
PrankerD (Dr. T. L.), Ontogeny of 
gravitational irritability in Osmunda 
_ regalis, 494. 
Precipitates, formation of, by Prof. 8. 
Oden, *432. 
Prehistoric flint factory at Aberyst- 
wyth, by R. Thomas and E. Dud- 
lyke, 477. 
Prehistoric sites in Dardanelles and 
Bosporus, by S. Casson, 475. 
Pripraux (E. B. R.), Membrane poten- 
tials considered as diffusion poten- 
tials, 433. 
Priestiry (Prof. J. H.), Cell wall and 
external medium, 495. 
Protozoan parasites, invasion of tissues 
of higher plants by, by Miss M. 8. G. 
Breeze, 456. 
Psychograms, by Dr. 
teth, *483. 
Psvcholocy and economics, relations of. 
by W. Piercy, *483. 
Transparent 
in certain 
M. E. Bickers- 
483, 506 
| Qualifying and competitive tests for 
admission to secondary schools, by 
T. Samuel, 499. 
QuanseR (Prof. H. M.), on virus 
diseases of plants, 492, 507 (K 300). 
Quantisation, by Prof. P. Ehrenfest, 
508. 
Quantum theory in chemistry, by Prof. 
G. N. Lewis, *432. 
Quaternary isostatic readjustments in 
N.W. Europe, by Prof. P. F. 
Kendall, 441. 
Races of the Middle East, by T. H. 
Walker, *474. 
Railway transportation, future of, by 
Col. E. O’Brien, 463, 505 (G 5). 
Ramspen (Prof. W.), Adsorption films, 
*482. 
Rayner (Dr. M. C.), . . . Biology of 
Mycorrhiza in the Ericacez, 486, 507 
(K 5). 
Red blood corpuscles under the micro- 
scope, by Dr. W. W. Waller, 479. 
Rees (Miss E. M.), Chromosomes and 
sterility in Muscari, 489. 
Regeneration of roots and shoots in 
cuttings of seakale, by Prof. W. 
Neilson Jones, 486. 
Rehousing of slum-dwellers, by J. J. 
Clarke, 462, 505 (F 10). 
RenpteE (Dr. A. B.), on 
Bry eA 
Repetitive work, by Miss I. Burnett, 
485. 
Resin canals in spruce wood, by Prof. 
Ocnothera 
R. B. Thomson and Dr. H. B. Sifton, 
*492. 
Reticularia lycoperdon, life-history 
and eytolegy of, by Dr. M. Wilson 
and Miss E. J. Cadman, 488. 
Reynoutps (Prof. S. H.), on photo- 
graphs of geological interest, 307. 
Rhinosporidium, life-history and affini- 
ties of, by Prof. J. H. Ashworth, 
451, 504 (D 18). 
Rheeadales, evolution and reversion in, 
by Miss E. K. Saunders, 485, 507 
(K 2). 
Rhythmic dancing, by Miss M. Einert. 
500, 507 (L 12). 
Rhytisma acerinum, life-history and 
cytology of, by 8. G. Jones, 487, 507 
(K 9). 
Rivgovr (E. H.), Soils of Wirral, 501. 
Ripceway (Sir W.), on Roman sites in 
Britain, 413. 
Risusetn (O. H. T.). Australian rail- 
way development, 458. 505 (E 6). 
