I9I2] 



Max Kahn and Jacob Rosenbloom 



89 



filter paper were placed with water in a bag of the finest grade of 

 parchment paper and dialyzed for forty-eight hours. The liquid in 

 the bag was then analyzed quantitatively for nitrogen. 



The appended summaries present the results obtained for urine 

 from the dog with the breast tumor and also for urine f rom several 

 normal dogs. 



In the Salkowski method for the determination of " colloidal " 

 nitrogen (as the results in the summary show), diffusible nitrog- 

 enous substance is precipitated as "colloidal" nitrogen. It has 

 not yet been shown that such diffusible nitrogenous matter in the 

 colloidal precipitate is true colloidal material. 



B. Date pertaining to the urine of the dog with a tumor of the breast 



The results demonstrate that the " colloidal " nitrogen, both 

 before and after dialysis, was greater in amount in the urine of the 

 dog with the tumor than that in the urines from normal dogs. 



It is desirable to study the effect of dialysis upon the " colloidal " 

 nitrogenous substances in the urine of Cancer patients. 



