Microscopic Study of Cultures 



213 



and recover it from the blood or organs, than to plate it out and 

 search for the colony among many others similar to it. 



Microscopic Study of Cultures. Some attention has been given 

 to the preparation of microtome sections of gelatin cultures, though 



Fig. 61. Modern incubating oven. 



not much practical value has come of it. It can be done by warming 

 the glass of the tube sufficiently to permit the gelatin containing the 

 growth to be removed in a lump and placed in Miiller's fluid (bichro- 

 mate of potassium 2-2.5, sulphate of sodium i, water 100), where it 



