14 



diet, if there were no reasons to avoid such a regimen, it would soon disappear. A 

 milk diet, too, would have such a result, as well if the milk were acidified by lactic- 

 acid ferments, as without previous acidification. So it was not possible in laboratory 

 experiments to cultivate the sarcina in butter-milk, and even fresh milk, acidified with 

 various quantities of lactic or phosphoric acid, gave only in few instances a feeble 

 growth. In absence of acid the growth of the sarcina in crude milk is quite im- 

 possible, this organism being overgrown by the other microbes. 



