122 



Tests in the Diagnosis of Cancer 



[March, 



end of 6 hr., the amount of precipitate is observed. Antipyrin and 

 creosote medications interfere, according to certain authors, with 

 this test. 



TABLE I 



Data pertaining to normal cases 



The accompanying tables present our comparative results. 



Table i shows the results obtained in normal subjects. The 

 nitrogen values for the zinc-sulfate precipitate, as compared with 

 those for total nitrogen, varied from 1.25 percent as a minimum, to 

 2.15 percent as a maximum, with an average of 1.67 percent. This 

 agrees with the results obtained by Salkowski and Kojo, and Ein- 

 horn, Kahn and Rosenbloom, who obtained respectively averages of 

 1.75 percent and 1.9 percent. Of 22 urines examined, 10 gave a 

 precipitate by the Salomon and Saxl method that was so light as not 

 to be weighable. The other 12 cases gave sulfate precipitates which 

 varied between 1.22 percent of the total sulfur as a minimum, and 

 2.14 percent of total sulfur as a maximum. In general the Salomon 

 and Saxl test was negative in all cases in which the neutral sulfur 



