LIQUID MEDIA. 9 1 



labelled, and, if necessary, placed in the in- 

 cubator, and the results watched from time to 

 time. Instead of bouillon liquid blood serum may 

 also be employed in this form of cultivation. If it 

 is required to preserve the drop cultivation as a 

 microscopic preparation, the cover-glass is gently 

 lifted off and allowed to dry. Any vaseline adher- 

 ing to the cover-glass should be wiped off, and the 

 cover-glass can then be passed through the flame 

 and stained in the usual manner. 



