JOURNAL OF THE COLLEGE OF SCIENCE, IMPERIAL UNIVERSITT, 

 TOKYO, JAPAN. 



VOL. XXV., ARTICLE 8. 



Coagulation of Colloidal Aluminium Hydroxide 

 by Electrolytes. 



By 

 Shin-ichi Kawamura, Rigakushi, 



1. Introduction. 



Physical chemistry, in its application to the problems of 

 biology, achieved many brilliant conquests with comparative ease, 

 particularly by means of the theory of osmotic pressure and that 

 of the mass-action. But the progress has been impeded by several 

 circumstances. Particularly the colloidal nature of the substances 

 which form living bodies seemed to present insurmountable dif- 

 ficulties. Yet through the combined labour of physical chemists 

 and physiologists these difficulties are being removed one by one ; 

 and at present there is no branch of physical chemistry which 

 is cultivated with greater ardour and whose progress is watched 

 with keener interest than the so-called colloid-chemistry. Of all 

 the results obtained iii this field the most definite and at the 

 same time the most interesting from the chemical stand-point 

 are those concerniug the coagulation of colloidal solutions by 

 electrolytes. The experimental works of Schulze, Picton and 

 Linder, Haedy, Biltz, Freundlich and others have thrown 

 much light on the complicated phenomena. 



It is only the so-called suspension colloids which are so 



