Accessory Apparatus 



259 



important corner of the laboratory will be of use to the 

 tyro. The 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. INFILTRATING OVEN, OPEN, SHOWING GAS REGULATOR, 

 THERMOMETER, 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 



172 



