138 



H. J. CONN 



TABLE 4 

 Summary of reports on methylen blue; samples arranged in order of excellence 



* These samples dissolve milk smears when used by the Breed method. 



The results are listed in table 3, in which the same set of sym- 

 bols is used as in table 1. A summary of the results is given 

 in table 4. The most apparent fact is that the best results in 

 staining have been obtained with the zinc-free dye. This is 

 presumably because of the insolubility of the zinc salt in alcohol, 



