Notes on Chemistry, &fc. 



29a 



The bottle used by Berzelius is fitted with a perforated cork, in 

 which is inserted a tube of the form and dimensions represented in 

 Fig. 2. A, B is a tube drawn out below and turned up, terminating 

 in a small orifice C. The small piece of quill tube D communicates 

 with A, B by the orifice E. A person tolerably skilled in the use of 

 the table blowpipe, can make one of these in ten minutes. 



The tube thus prepared is fixed, by means of a perforated cork, 

 in a bottle containing water, and reversed over the filter, as in Fig. 

 3. so that the orifice C is placed just below the upper surface of the 

 liquid in the filter. When this liquid falls below a line FG, the 

 weight of the column of water from E to FG overcomes the capil- 

 lary attraction, which retained a portion of water in the tube D • air 



