460 



S. HENRY AYERS AND COURTLAND S. MUDGE 



major gi-oups (animal, vegetable, and mineral) and the amount 

 of fat diminished to 0.2 per cent, 0.1 per cent, 0.02 per cent and 

 0.002 per cent. In table 4 the results are given. It will be 

 seen that the counts tended to decrease with the lessened amount 



TABLE 3 

 Effect of various fats and oils on the growth of a streptococcus 



PAT OR OIL (I PER CENT USED) 



Control without oil 



Sesame 



Chaulmoogra 



Castor 



Com 



Rape seed 



Lumbang 



Coconut 



Peanut 



Peanut 



Soy bean 



Olive 



Chia seed 



Mustard seed 



Okra seed 



Linseed 



Lard 



Lard 



Lard , 



Butterfat 



Cod liver 



Mineral 



Mineral 



Vaseline 



Vaseline 



Paraffine, solid 



Paraffine, solid 



of fat or oil but even small quantities caused a marked stimula- 

 tion. In plating these oil media it was difficult to keep the 1 

 cc. sample drawn from the flask free from drops of oil and per- 

 haps this is the explanation of some of the inconsistencies seen 



