CONTENTS. 
PAGE 
A critical description of three cases of Single Hypogastric artery in the 
Human Foetus. (With Plates XII and XIII.) By W. L. H. Duck- 
worth 325 
On the Fatigue of Metals subjected to Radium Rays. By J. A. Crowther 340 
The Orientation of a Series of substituted Bromanilines. By J. K. Hill. 
(Communicated by Mr H. 0. J ones) ...... 351 
The decomposition and nitrification of seivage (1) in alkaline solutions , 
(2) in distilled water. By J. E. Purvis and R. M. Courtauld . 354 
The influence of light and of copper on fermentation. By J. E. Purvis 
and W. A.R. Wilks ' .361 
Sexual Phenomena in the Free-living Nematodes. By F. A. Potts . 373 
Resolution of Optically active Ammonium Salts by means of Tartaric 
Acid. By H. 0. Jones 376 
Studies on Platinocycmides. By L. A. Levy . . . . . .378 
The absorption spectra of collidine and 9-chlor-collidine. By J. E. 
Purvis and W. H. Foster 381 
The Action of metallic Magnesium on certain aliphatic acids, and the 
detection of Formic acid. By H. J. H. Fenton and H. A. Sisson . 385 
Some colour-reactions of organic acids with Phenols. By H. J. H. 
Fenton and G. Barr 386 
An example of complex double integration. By A. C. Dixon . . . 388 
On a new genus of Ixodoidea together with a description of eleven new 
species of ticks. By Prof. George H. F. Nuttall and Cecil 
WarburtoN 392 
On the ionization of Gases by Ultra- Violet Light and on the evidence as 
to the structure of light afforded by its Electrical Effects. By Prof. 
J. J. Thomson 417 
Note on a method of demonstrating the syncytial appendages of the 
placental villi. (With Plate XI Y.) By W. L. H. Duckworth 425 
On the Intestinal Protozoan Parasites of Frogs and Toads. (Preliminary 
Communication.) By C. C. Dobell 428 
