264 MICBOBES, FEEMENTS, AND MOULDS. 



liquid to be examined in Eanvier's moist chamber, 

 consisting of a glass holder, with a circular groove and 

 a flat space in the centre. On the top is a cover-glass, 



t 



c .i 



Fig. 103. — Different formB of culture flasks employed by Pasteur (from Duclaux). 



which is bordered with paraffin or vaseline, in order to 

 seal it. The groove contains air and a little liquid. 



