Am.  Jour.  Pharm.  \ 
May,  1878.  > 
Fluid  Extracts  by  Repercolation. 
239 
Scale,  one-sixth  of  the  actual  linear  size. 
the  height  at  which  this  column  of  liquid  ceases  to  flow  over  is  a 
measure  of  the  comparative  density  of  the  liquid  within  and  without. 
As  seen  in  the  cut  the  liquid  will  not  flow  over  into  the  bottle  although 
