298 



CLEAN MILK 



"Oidium on the plates. They are thin, and spread rapidly over the 

 surface; they may be recognized under the microscope because at 

 first they are seen to be composed of threads like a mold, which 

 soon break up into short sections. The colonies usually become 

 about % inch in diameter. 



8. Cheese Mold. — On the same plates, after 2 or 3 days, 

 ■will appear a white mold. This grows more slowly than the Oidium, 



Fig. 7r 



/?? : 



Cutter for Making Potato Plugs, Method of Cutting them and Placing Them in Tubes. 



and its threads do not break up into spores. Spores form on the 

 surface upon special branches. 



Both the Oidium and mold may be isolated for future study 

 if time permits. 



9. Testing Characters of Bacteria. — Inoculate the several 

 bacteria previously isolated and purified, into various media. In. 

 doing this it is best to make first a fresh agar slant from each 



