CONTENTS. 



PAGE 



The Laws of Mobility and Diffusion of the Ions formed in Gaseous Media. 



By E. M. "Wellisch. (Communicated by Sir J. J. Thomson) . 1 



TTie Radioactivity of Ruhidi^(,m. By Norman Campbell . . . 11 



On the Free Fressitre in Osmosis. By L. Vegard. (Communicated by 



Sir J. J. Thomson.) (Two figs, in Text) . . . . . .13 



Therapeutic Inocidation for Generalised Bacterial Infections. By L. 

 Noon. (Commixnicated by Professor G. Sims Woodhbad.) (Six 

 figs, in Text) ... . ... . . . .24 



On the examination of living leucocytes in vitro. By Constant Ponder. 



(Communicated by W. E. Dixon.) (Two figs, in Text) . . . 30 



On the Relation hetween Ionization and Pressure for Rontgen Rays in 

 different Gases. By J. A. Crowther. (Communicated by Sir J. J. 

 Thomson.) (Two figs, in Text) . . . . . . .34 



On the Relative Ionization produced by Rontgen Rays in different Gases. 



By J. A. Crowther. (Communicated by Sir J. J. Thomson) . 38 



The Relationship hetiveen Human and Bovine Tubercidosis. By Professor 



G. Sims "Woodhead . . . . . . . . • • 40 



The radiation of various spectral lines of neon, helium and sodium in a 



magnetic field. By J. E. Purvis . . . . . . . 45 



The transmission of Trypanosoma lewisi by fleas and lice. By Professor 



G. H. F. NUTTALL . . . . . . '. . . .53 



The presence of anticoagulin in the salivary glands of Argas persicus. 



By Professor G. H. F. Nuttall , 53 



The mode of actio7i of specific substances. By W. E. Dixon and 



P. Hamill . ... . . . . . . . 54 



The action of specific substances in toxaemia. By W. E. Dixon and 



W. H. Harvey . . .54 



The Migration Constcmts of Dilute Solutions of Hydrochloric Acid. By 



C. Chittock. (Two figs, in Text) . -. . . . . . 55 



On the Carriers of the Positive Charges of Electricity emitted by hot tvires. 



By Sir J. J. Thomson . • .64 



On the Electric Theory of Gravitation. By Sir J. J. Thomson. (One fig. 



in Text) . . . . . • . ■ ■ ■ ■ - 65 

 On the Distribution of Electo'ic Force along the Striated Discharge. By 



Sir J. J. Thomson . . . 70 



