METHODS OF STUDY 



23 



upon the table before sterilizing, as the purpose for 

 which they are used makes them a constant source 

 of danger. 



Cleaning Glassware. — The glassware used in the 

 laboratory consists of flasks, culture tubes, and 

 dishes of various sizes and shapes, with and with- 



Petri dish. Fig. 10. 



(Cover shown partially raised.) 



Stendei dish. 



out covers, small oblong (1x2 inches) pieces of 

 glass called slides, small round cover glasses, glass 

 rods, and glass pencils. 



When new or after using, glassware should be put 

 into a strong soapsuds, which should be brought to 

 the boiling point 

 and continued for 

 ten minutes, fol- 

 lowed by vigorous 

 brushing with a 



tube-brush, rinsed with running water until every 

 particle of soap has been removed, turned upside 

 down to drain in a wire basket, and put into the 

 hot-air sterilizer for twenty minutes. 



Fig. 11. — Novy's cover-glass forceps. 



