!270 
Practical  Notes. 
j  Am.  Juur.  Pharm. 
1      May,  1883. 
vessel  with  the  hand.  The  side  orifice  near  the  bottom  of  the  perco- 
Jator  is  then  connected  with  the  reservoir  by  means  of  the  rubber  tube. 
The  reservoir  stands  on  a  shelf ;  the  percolator  is  supported  by  the 
rings  of  a  retort  stand.  The  cork  of  the  receiver  is  first  slipped  on  to 
the  glass  tube  of  the  percolator,  and  then  brought  down  into  the  neck 
of  the  receiver.  This  cork  should  have  a  small  escape-hole  in  it. 
The  apparatus  is  now  ready. 
The  ethereal  mixture,  consisting  of  a  pint  of  rectified  ether  and 
three  ounces  of  acetic  ether,  is  poured  into  the  reservoir,  and  the  cork 
inserted.  The  flow  is  determined  by  liaising  the  cork  of  the  reservoir 
from  time  to  time.  When  the  ethereal  liquid  has  completely  perme- 
ated the  powder,  the  supply  of  ether  is  stopped.  The  drug  should  be 
allowed  to  macerate  for  a  few  hours,  after  which  the  percolation  may 
proceed,  drop  by  drop.  A  pinch-cock  on  the  rubber  tube  will  regu- 
late the  flow.  As  soon  as  the  reservoir  is  emptied,  half  a  pint  of  alco- 
Jiol  is  poured  in,  and,  when  again  empty,  water  is  employed  to  finish 
the  displacement. 
If  a  steady  stream  of  the  menstruum  is  desired,  a  small  piece  of 
^lass  tube  is  passed  through  the  cork  of  No.  1,  and  connected,  by  means 
of  rubber  hose,  with  a  similar  piece  through  the  cork  of  No.  3.  Equi- 
librium is  thus  maintained. 
The  exhausted  powder  may  be  removed  from  the  percolator  by 
means  of  a  stream  of  water,  which  is  injected  through  the  smaller 
orifice  by  the  aid  of  a  hose  attached  to  the  faucet  of  the  water  supply. 
— Proc.  Cal  Phar,  Soc,  1883,  p.  40. 
PRACTICAL  NOTES  FROM  VARIOUS  SOURCES. 
By  the  Editor. 
Potassium  Chlorate  and  Glycerin.. — Fred.  Grazer  observed  that  a 
mixture  of  saturated  solution  of  potassium  chlorate  (1  to  16)  and 
glycerin,  remains  clear  for  a  short  time  only,  and  then  deposits  crystals 
of  the  chlorate  unless  a  small  portion  of  water  is  added. — Proc.  Cal. 
Phar.  Soc,  1883,  p.  50. 
Liquor  Laccce  albce  is  recommended  by  S.  A.  McDonnell  as  a  "  label 
preserver,^'  it  forming  a  colorless  varnish  suitable  for  the  protection  of 
labels  on  jars  and  bottles  which  do  not  contain  strong  alcoholic  liquids. 
Jt  is  made  by  dissolving  1  ounce  of  white  shellac  in  moderately  fine 
powder  in  half  a  pint  of  ether,  agitating  the  solution  with  4  drachms 
