GLASSWARE FOR CULTURE MEDIA 6$ 



EXERCISE XXVII 

 PREPARATION OF GLASSWARE FOR CULTURE MEDIA 



98. It is important that the technique in plugging and steril- 

 izing test tubes and flasks and in making culture media should 

 be thoroughly understood. For this reason it seems desirable 

 to again prepare and sterilize the glassware and to repeat the 

 preparation of certain of the more commonly used culture 

 media. Hereafter, in the course, the janitor will clean all 

 glassware, and the instructor will furnish all additional media 

 required. It will be necessary in the following exercises to 

 overlap, to a considerable extent, by way of inoculating media 

 and in making the final examinations of cultures the w^ork 

 of succeeding exercises. 



99. Work for this Exercise — Plug and sterilize the test 

 tubes and flasks and sterilize the Petri dishes which have 

 already been used and cleaned (Exercise XXVI). 



