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SUMMARY OF CURRENT RESEARCHES RELATING TO 
intensified owing to the pressure within the filter, the jaws d of the 
caoutchouc stopper are pressed firmly against the vent, and all escape 
of gas and liquid prevented. The large upper opening is closed by 
the lid G, kept in position by the metal ring p 15 </ 2 and the washer g» 
Fig. 110. 
This lid is perforated by two oiifices, H and j\. The liquid to be 
filtered is poured in through H after removal of the screw h l ; and the 
pressure is communicated from the above-mentioned cylinder through 
the tube i 1 and controlled by the cock i* 2 . In filling, the cap h l is 
