126 



BACTERIOLOGY. 



side (Fig. 54). The former, s, is of metal, andihe latter, a, of glass 

 fitted with a thermometer, the bnlb of which, k, is contained within 

 the box. A partition, s, keeps up a current between the openings 



Fig. 



55. — Gas Ghambek in use with Appaeatus fou Generating 

 Caebonic Acid. 



of the pipes, which are supported on a stand and connected by 

 tubing with the hot-water supply. 



A mixture of paraffine and vaseline is recommended for indicating 

 the temperature of the chamber, and experience has shown that if 

 a temperature of 37° 0. is required the temperature of the water 

 in the box must range between 42° and 47° C. 



Fig. 56.— Gas Chambek. 



Gas Ghamhers. — To investigate the action of gases or vapours 

 upon micro-organisms, a modification of the moist cell may be 

 emplo3'ed. 



A jjiece of glass tubing is first fixed to the slide by means of 



