4 LABORATORY BACTERIOLOGY 



and boil for lo minutes. Then pour off the acid and rinse 

 the cover glasses, one at a time, using forceps for handling, 

 in distilled water and finally in ether-alcohol. When needed, 

 wipe with a piece of cheese cloth that has been properly 

 prepared by soaking in a 5 % solution of caustic soda for a 

 few hours, then rinsed in water, and then placed for a few 

 hours in dilute (10%) hydrochloric acid, after which it should 

 be thoroughly rinsed in distilled water and dried. Before 

 wiping the covers cleanse the hands thoroughly in soap and 

 water, then in ether. 



5. Laboratory notes. In this and all subsequent exercises 

 careful notes should be taken on the work done. When, how- 

 ever, as in this exercise, it consists simply of carrying out 

 directions, a simple statement that the work as directed was 

 completely or partially done, as the case may be, is all that is 

 necessary. In all other cases describe fully the work per- 

 formed and observations made. 



The notes should be as brief as completeness will permit. 

 They should be legibly written and the technical terms peculiar 

 to the subject in hand should be correctly used. The notes are 

 to be handed to the instructor each week for examination and 

 correction. When returned, all corrections should be carefully 

 noted and similar errors should be avoided thereafter. 



