CONTENTS. 



PAGE 



The Expansion of a Gas into a Vacuum and the Determination of the 



Specific Heat at Constant Pressure f 'or Oases. By G. F. C. Searle. 241 



A Novel Instrument for Illustrating the Magnetic Properties of Iron. 

 (With Plate III.) By A. H. Peake 



On the Action of Radium and other Salts on Oelatin. By W. A. 

 Douglas Rudge . . . . 



250 



258 



Susceptibility of Iron in Colloidal Solution. By E. F. Burton and 



P. Phillips. (Communicated by Prof. J. J. Thomson) . . . 260 



A Method of following the Course of certain Chemical Actions, and a 

 Period of Induction in the Action of Excess of Water on Mono- 

 chloracetic Acid. By P. V. Bevan . . . . . . 269 



The Radio-activity of Metals and their Salts. By Norman R. Campbell 282 



On a Relation between the Velocity and the Volume of the Ions of certain 

 Organic Acids and Bases. By T. H. Laby and G. A. Carse. 

 (Communicated by Prof. J. J. Thomson) 288 



On the Reduction of the General Ternary Quintic to Hilberfs Canonical 



Form. By H. W. Richmond . . . . . . . . . 296 



An Indicator for Strong Acids and Bases. By H. J. H. Fenton . . 298 



Notes on Cycads : with Exhibition of a Rare Species (Cycas Micholitzii) 



acquired by the Botanic Garden. By A. C. Seward . . 300 



Experiments on the Hybridisation of Barleys. By R. H. Biffen . . 304 



A Preliminary Note on the Maiotic Phenomena in' the Eggs of the Her- 

 maphrodite " Angiostomum nigrovenosum" ("Ascaris nigrovenosa ") 

 (With Plate IV.) By S. A. M^Dowall . "■ . 



The Action of Acidchlorides of Acetylenic Acids on Ketonic Compounds. 

 By S. Ruhemann . . . 



309 



313 



316 



The Dihydrotetrazines. By S. Ruhemann . . 



A Theory of the Widening of Lines in Spectra. By Prof. J. J. Thomson 318 



On Secondary Rontgen Radiation. By Prof. J. J. Thomson . . . 322 



