140 
Oak.eEy, C. A., Vocational guidance 
surveys, 377, 471. 
OakLeY, K. P., Pearl- like bodies in 
certain Silurian Polyzoa, 310, 466. 
O’DeLL, A. C., Population changes 
in Aberdeenshire, 335. 
OrseR, Dr. O. A., Psychological 
aspects of ‘ laissez-faire ’ in educa- 
tion, 380, 471. 
Officers and Council, v. 
Oac, Dr. W. G., Soil and ecological 
studies in relation to forestry and 
grazing, 403. 
Ocitviz, Prof. A. G., Co-operative 
research in geography, 99, 327*. 
Ocitviz, Prof. F. W., International 
trade accounts, 341*. 
Opinion and insight, by J. Drever, 
jun., 379. 
Optical exaltation, origin in con- 
jugated hydrocarbons, by Dr. 
C. B. Allsopp, 291, 464. 
Ordovician rocks of New Zealand, 
by Prof. W. N. Benson, 311, 465. 
Orr, Dr. J. B., Nutrition in relation 
to disease, 363, 470. 
Ostracod spermatozoa, movement 
of, by A. G. Lowndes, 318. 
Ox ey, T. A., Influence of light and 
temperature on growth, 382, 471. 
PacE, H. J., Fodder conservation on 
farm, 400, 473. 
Papermaking, by J. 
Duguid, 348, 468. 
Papermaking in Aberdeen district, by 
J. Cruickshank, Appdx., 91. 
PaTERSON, C. C., Photoelectricity, 
art and politics, 276*, 445. 
PEARSALL, Dr. W. H., Causes of 
algal abundance, 319. 
Peats and peaty soils, by Dr. G. K. 
Fraser, 404. 
Pen Dinas hill fort, report on, 263. 
PENROSE, Dr. L. S., Inheritance of 
mental ability, 378, 472. 
PENTELOW, F. 'T. K., Food of some 
freshwater fishes, 320*, 466. 
Periodic hardness fluctuations in- 
duced in metals, by E. G. Herbert, 
284, 464. 
Peripatus, by Dr. S. M. Manton, 
316*. 
Abel and J. 
INDEX 
Perseveration, discussion, by Dr. 
Ll. W. Jones, Dr. W. Stephenson, 
Dr. P. E. Vernon, Rev. Dr. J. L. 
King, 372, 471. 
Petcu, T., on Fungi on flies in Pin 
Hole Cave, 255. 
Peterhead and Cairngall granites, by 
Dr. S. Buchan, 303, 466. 
Petrol engine, flame temperatures 
in, by B. Lloyd-Evans and S. S. 
Watts, 284, 464. 
Petrology of dike rocks of high 
magnetic susceptibility, by A. T. J. 
Dollar, 312. 
PHEMISTER, Dr. J., Age of Moine 
and Dalradian formations, 307,465. 
Puiuip, Dr. G., Scientists of north- 
east of Scotland, Appdx. 106. 
Puituipes, L. H. J., Prof. Zernike’s 
phase contrast method of micro- 
scopic illumination, 277. 
Puitpott, Dr. S. J. F., Conven- 
tional measures of fatigue, 376*. 
Photoelectricity, art and politics, by 
N. R. Campbell and C. C. Pater- 
son, 276*, 445. 
Physical methods in chemistry, by 
Prof. T. M. Lowry, 29, 290*. 
Physics, new world-picture of modern, 
by Sir J. H. Jeans, 1. 
Physiological and psychological de- 
velopment of child and adolescent 
and claims made on education, 
by Col. C. J. Bond, 395, 472. 
PickForD, Dr. R. W., Group psycho- 
logy of Barbizon painters, 378, 471. 
Pictish symbolism and_ sculptured 
stones of north-east Scotland, by 
Dr. W. D. Simpson, Appdx. 66. 
Pin Hole Cave, fungi on flies in, by 
T. Petch, 255. 
Pin Hole Cave, rodent remains from, 
by Dr. J. W. Jackson, 256. 
PiquE, J., Preservation of fish as 
food, 370. 
Plankton, origins of, by Prof. F. E. 
Fritsch, 319*, 466. 
Planning, economic, discussion by 
Prof. D. H. Macgregor, Prof. A. 
Gray, Prof. W. F. Bruck, Sir 
Josiah Stamp, 340%, 467. 
Planning of agricultural production, 
by Sir A. D. Hall, 401, 473. 
Plant life and philosophy of geology 
by Prof. W. T. Gordon, 49, 304* 
