Index. 237 
SEARLE, G. F. C., The determination of the effective aperture of the stop 
of a photographic lens, 195. 
Surry, A. M., Elected Fellow 1914, November 9, 152. 
Stop of a photographic lens, Effective aperture of the (SEARLE), 195. 
Structure of the mouth-parts in the Body-louse (HaRRIsoN), 207. 
Synthetic Logic, Studies in (WIENER), 14. 
Tuomas, H. HamsHaw, On some new and rare Jurassic plants from York- 
shire: The male flower of Williamsonia gigas (Lind. and Hutt.), 105. 
THompson, W. R., The Cuticula of Insects as a means of defence against 
Parasites, 51. 
Tomson, J. J., Experiments with slow Cathode Rays, 152. 
—— Theory of the Mobility of Negative Tons, 153. 
WEATHERBURN, C. E., Elected Fellow 1915, November 22, 232. 
— Vector Integral Equations and Gibbs’ Dyadics. See Transactions, 
EXIT 
Waite, G. W., The Origin of the “ Wolf-note” in Bowed Stringed Instruments, 
85. 
WiENER, N., Studies in Synthetic Logic, 14. 
The Shortest Line Dividing an Area in a Given Ratio, 56. 
Williamsonia gigas (Lind. and Hutt.), the male flower of (THomas), 105. 
Wiis, J. C., Some considerations on the geographical distribution of 
species, 233. 
Witson, C. T. R., Determination of the thickness of thin plates by an 
interference method, 153. 
“Wolf-note,” Origin of the, in Bowed Stringed Instruments (WuirTkE), 85. 
Yorkshire, Jurassic plants from (THomas), 105. 
ZELENY, J., On the Conditions of Instability of Electrified Drops, with 
Applications to the Electrical Discharge from Liquid Points, 71. 
CAMBRIDGE: PRINTED BY J. B, PEACE, M.A., AT THE UNIVERSITY PRESS, 
