BOTS RADIO-MICROMETER. 



Write for 



New Physical List, 



No. 88 P. 



Our improved design fitted with heavy copper case secures 

 great steadiness of zero. 



Suspension can now be clamped, thus allowing the instru- 

 ment to be moved about with safety. 



THE CAMBRIDGE SCIENTIFIC INSTRUMENT CO., Ltd. 

 Cambridge, England. 



Price Three Shillings, post free. Svo, cloth, 2 plates. 



BROWNIAN MOVEMENT AND 

 MOLECULAR REALITY. 



By M. JEAN PERRIN 



(PROFESSEUR DE CHIMIE PHYSIQUE, FACULTY DES SCIENCES, 

 UNIVERSITY DE PARIS). 



TRANSLATED FROM THE 



AMALES DE CHIMIE ET DE PHISIQUE. 8 me Series, 

 September 1909, 



By F. SODDY, M.A., F.R.S. 



Taylor and Francis, Red Lion Court, Fleet Street, E.C. 



