390 
Gasometric  Analysis. 
{  Am.  Jour.  Phariru 
I     August,  1902. 
described  in  this  paper,  the  use  ot  the  homeo-vial  had  been  found  a 
source  of  more  or  less  trouble,  and  this  has  been  superseded  by- 
transferring  the  tunnel-tube  from  the  reservoir  d  to  the  generator  £\ 
The  illustration  will  clearly  show  the  new  arrangement. 
A  piece  of  iron  wire,  sharpened  at  one  end,  is  stuck  into  the  cork, 
the  other  end  is  bent  into  a  circle  so  as  to  support  the  funnel. 
Attention  is  directed  to  the  following  points  to  prevent  likely  sources 
of  error : 
(1)  The  small  tube  e,  to  which  the  funnel-tube  is  attached,  should 
project  about  y2  inch  below  the  lower  surface  of  the  cork,  otherwise 
it  may  happen  that  in  allowing  liquids  to  enter  through  this  tube 
some  may  be  carried  along  the  cork  and  escape  into  the  exit  tube  cy 
causing  loss. 
(2)  The  following  order,  in  preparing  for  a  determination,  should 
be  observed :  Disconnect  apparatus  at  c  and  remove  stopper  from 
g;  charge  the  generator  g  with  the  specified  materials;  adjust  the 
lunnel-tube  by  filling  the  funnel  with  the  proper  liquid  and,  by  com- 
pressing the  rubber  tubing  at  the  position  ot  the  small  glass  plug  a, 
allow  the  liquid  to  fill  the  small  sections  of  rubber  and  glass  tubing 
and  displace  the  air  (when  this  has  been  accomplished  allow  the 
liquid  to  drop  from  the  glass  tube  until  the  liquid  in  the  funnel  is 
on  a  level  with  the  upper  end  of  the  rubber  tubing  b) ;  replace  the 
ccrk  in  the  generator  ;  fill  the  reservoir  d  with  water  after  removing 
the  stopper,  replace  the  latter  and  place  the  outer  end  of  the  siphon- 
tube  /  into  a  vessel  containing  water ;  by  applying  suction  at  c  this 
Apparatus  for  Gasometric  Analysis. 
