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ON  CAMPHOR  WATER.  16? 
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dissolved  as  sulphate,  and  the  camphor  separated  by  the  process 
was  collected  on  a  small  filter,  washed  with  camphor  water  to 
remove  adhering  sulphate  of  magnesia,  then  dried  by  pressure 
between  folds  of  bibulous  paper. 
The  camphor  is  now  in  the  form  of  a  dirty  gray  cake,  be- 
ing in  fact  very  "  crude".  To  purify  it  we  dissolve  it  in  a 
small  portion  of  chloroform,  and  throw  the  solution  into  a  small 
funnel,  the  neck  of  which  is  stopped  with  a  bit  of  cotton,  and 
finally  the  camphor  obtained  by  the  spontaneous  evaporation 
of  the  chloroformic  solution  is  carefully  weighed,  and  the 
amount  obtained  deducted  from  the  120  grains  of  camphor  used 
in  the  first  instance. 
Six  experiments  were  made  at  various  times  with  the  follow- 
ing results : 
1.  120  grs.  camphor  used,  55  grs.  obtained  from  the  magma. 
2.  120  grs.       "  "    59  grs. 
3.  120  grs.       "  "    54  grs. 
4.  120  grs.       "  "    56  grs. 
5.  120  grs.       "         "    57  grs. 
6.  120  grs.       "  "    55  grs. 
The  average  amount  by  these  experiments  being  fifty-six 
(56)  grains,  from  the  120  grains  used  each  time. 
Deducting  56  grains  from  120  grains  gives  us  sixty-four  (64) 
grains,  which  must  be  the  amount  of  camphor  held  in  solution 
by  two  pints  of  the  Camphor  Water  of -the  U.  S.  Pharmacopoeia, 
being  in  the  proportion  of  two  (2)  grains  to  the  fluidounce. 
The  British  Pharmacopoeia  orders 
Camphor  broken  in  pieces,  half  an  ounce,  (avoirdupois)  (219 
grains  troy,  within  a  fraction.)  ■ 
Distilled  water  one  gallon  (imperial  measure.) 
Enclose  the  camphor  in  a  muslin  bag,  and  attach  this  to 
the  stopper  of  a  jar  containing  the  distilled  water.  Invert  the 
jar,  allow  it  to  stand  at  least  two  days,  and  pour  off  the  solution 
when  required. 
.  One  imperial  gallon  of  Camphor  Water  was  made  by  the 
British  process,  and  after  standing  three  days  the  undissolved 
camphor  dried  carefully  between  folds  of  filtering  paper  and 
carefully  weighed. 
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