128 



BACTERIOLOGY 



nally two or three clamps, the jaws of which are cushioned with cork 

 or with rubber, are fastened on the flanges, pressing them firmly 



FIG. 56. Tripod and siphon flask for anaerobic culture by combined hydrogen and 



pyrogallate method. 



together. The jar is now attached to a source of pure hydrogen 

 so that the gas enters at the top of the jar. The other open- 

 ing is connected with a wash bottle containing water which 



