126 



BACTERIOLOGY. 



side (Fig. 54). The former, z, is of metal, and .the latter, a, of glass 

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

 the box. A partition, s, keep.^i up a current between the openings 



Fig. 



-Gas Chambee in use with Appabatds fob G-enekatikg 

 Cakbonio 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° C. is required the temperature of the water 

 in the box must range between 42° and 47° 0. 



Tig. 56. — Gas Ohambeb. 



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

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

 employed. 



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



