156 



ELEMENTARY CHEMICAL MICROSCOPY 



material tenaciously since they lock firmly in place, and thus 

 the ringers do not become cramped during prolonged heat 

 treatments. 



Work Tables. — The type of work table chosen by the chemist 

 upon which to place his instruments and apparatus for micro- 

 chemical investigations will depend largely upon his individual 

 preferences or upon the character of the work he is called upon 

 to perform. 



