10 



EXPERIMENTAL DAIRY BACTERIOLOGY 



In the autoclave a higher temperature is employed, and all 

 resistant forms are destroyed in one heating. In order to be 



FIG. 5. COTTON PLUGS 



A, a well-made plug ; B, a plug that will easily become displaced ; C, a plug 

 that does not protect the mouth of the tube from dust 



successful in the use of the autoclave certain points must be 

 noted. Before using, care should be taken to observe whether 

 there is a sufficient supply of water in the autoclave. After 



