250 MICROBES, FERMENTS, AND MOULDS. 
in its upper part. This receiver is connected by a 
caoutchoue tube with the vessel which contains water 
SN 
\ 
LAV 
SS SY a 
SENS SS 
SS 
= 
S& 
Fig. 101,—-Section and elevation of Chamberland’s filter, 
for filtering. When the vessel is placed two or three 
metres above the filter, from fifteen to twenty litres 
