Accessory Apparatus 259 



important corner of the laboratory will be of use to the 

 tyro. TJie oven is supported over the gas-burner by a four- 

 legged iron stand ; the legs fit into depressions on the zinc- 

 covered bench. Upon the top of the oven is seen a rack, in 



Fig. 72. — Infilteatino Oven, Open, showing Gas Regulator, 

 Thermometee, etc. 



which the ribbons of sections are dried to the slides (sub- 

 sequently described). This rack is seen to be resting upon 

 a sheet of plate-glass placed upon the top of the oven upon 

 corks. This glass answers two purposes. The heat from 

 the oven keeps it nicely warm, so that it is a convenient 



17—2 



