CONTENTS. 
PAGE 
The influence of a strong magnetic field on the spark spectra of lead, tin, 
antimony, bismuth and gold. By J. E. Purvis .... 217 
A representation of the exponential function as an infinite product. By 
G. B. Mathews . 228 
On the transmission of Earthquakes through the Earth. (Second paper.) 
By Rev. 0. Fisher . 231 
The Selective Absorption of Rontgen Rays. By G. W. C. Kate. (Com- 
municated by Prof. J. J. Thomson) ....... 236 
Parasitic Trees in Southern India. (With Plates I — III.) By C. A. 
Barber. (Communicated by Prof. Seward) .... 246 
On the Longitudinal Impact of Metal Rods with rounded ends. By 
J. E. Sears. (Communicated by Prof. Hopkinson) . . . 257 
The number of Electrons in an Atom. By Norman Campbell . . 287 
Notes on the Structure and Behaviour of the Larva of Anopheles 
maculipennis, Meigen. (Preliminary note.) By A. D. Imms. 
(Communicated by Mr A. E. Shipley) ...... 292 
Physiology of Plants in the Tropics. By A. M. Smith. (Communicated 
by Mr F. F. Blackman) 296 
Notes on the parasitism of Botrytis. By F. T. Brooks. (Communicated 
by Mr F. F. Blackman) 298 
The histology of the early placenta of Macacus nemestrimis. (With 
Plates IV — XI.) By W. L. H. Duckworth 299 
On the theory of the rotation of the plane of polarization by solutions. 
By Prof. J. J. Thomson 313 
Proceedings at the Meetings held during the Session 1906 — 1907 . 
. 318 
