Am.  Jour.  Pharm. ) 
Feb.,  1881.  J 
Use  of  the  Rubber  Nipple. 
63 
tubing  in  the  opening  at  the  top,  as  in  Figs.  7,  8,  9.  Perforated  corks 
are  troublesome  to  make,  the  fib'ng  consuming  a  great  deal  of  time ; 
but  in  using  the  nipple  all  this  is  avoided. 
5.  For  luting  corks  on  tubulated  retorts,  as  in  Fig.  12.    Instead  of 
of  using  linseed 
fr 
meal,  fenugreek 
or  plaster  of  Paris, 
nipples  or  rubber 
finger  -  cots  are 
very  convenient, 
as  also  for  pre- 
venting volatile 
chemicals,  such  as 
chlorine  water, 
sulphurous  acid 
and  bisulphide  of 
-carbon,  chloroform,  ether,  etc.,  from  evaporating,  after  the  bottles  have 
once  been  opened  for  dispensing. 
6.  For  constructing  a  syphon  (Fig.  10),  we  take  a  doubly  perforated 
cork,  a,  draw  a  nipple,  b,  over  one  end  and  a  short  glass  tube,  c, 
through  the  top  hole  of  the  nipple,  then  introduce  the  bent  glass  tube, 
d,  for  suction,  and  the  short  straight  glass  tube,  e,  and  attach  the  rub- 
ber tubbing,/.  This  completes  the  apparatus.  In  using  it,  close  ori- 
fice of  c  with  finger  and  suck  at  d,  then  at  c. 
My  siphon 
has  greaf  ad- 
vantages over 
the  glass  sy- 
phon. It  can 
be  made  with- 
out great  ex- 
j^ense,  is  not 
so  liable  to 
break,  can  be 
easily  taken 
apart  and 
cleaned,  the 
rubber  tubing 
can  be  extended  to  any  length,  and  the  entire  apparatus,  when  not  in 
