4 LABORATORY BACTERIOLOGY 
and boil for 10 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. 
‘ 
