SOLUBILITY  OF  CAMPHOR  IN  WATER. 
19T 
From  the  above  experiments  we  may  conclude  that  neither 
of  the  reagents  used  possess  the  power  to  remove  camphor  from 
its  aqueous  solution  more  than  to  a  very  limited  extent,  while 
three — solution  of  potassa,  ether  and  chloroform — failed  en- 
tirely. 
I  then  turned  my  efforts  to  getting  out  the  undissolved  por- 
tion of  the  camphor  mixed  with  the  carbonate  of  magnesia. 
After  many  experiments  the  following  process  was  adopted  as 
giving  the  most  satisfactory  results  : 
1st  exp.  Two  pints  of  camphor  water  was  carefully  prepared, 
and  the  magma  of  carbonate  of  magnesia  and  camphor  remain- 
ing on  the  filter  was  transferred  to  a  small  beaker,  and  treated 
with  dilute  sulphuric  acid  in  very  slight  excess,  thereby  dissolv- 
ing the  magnesia  as  sulphate,  while  the  camphor  rose  to  the 
surface  and  was  collected  on  a  small  filter,  washed  with  camphor 
water,  to  remove  adhering  sulphate  of  magnesia,  dried  between 
folds  of  bibulous  paper,  by  which  means  it  was  obtained  in  the 
shape  of  a  dirty,  gray  cake,  mixed  with  the  impurities  derived 
from  the  carbonate  of*  magnesia  and  shreds  from  the  filter.  To 
obtain  the  camphor  pure,  the  mixture  was  treated  with  chloro- 
form, the  solution  thrown  into  a  small  funnel,  the  neck  of  which 
was  stopped  with  a  little  cotton  ;  and  finally,  the  camphor  ob- 
tained by  the  spontaneous  evaporation  of  the  cloroformic  solu- 
tion, was  carefully  weighed,  and  gave  a  yield  of  fifty-five  grains. 
2d  exp.  With  like  quantities  and  manipulation  gave  a'  yield 
of  fifty-nine  grains. 
3d  exp.  do.    do.    fifty-four  grains. 
4th  exp.  do.    do.    fifty-six  grains. 
The  average  amount  obtained  by  these  experiments  being 
fifty-six  grains ;  deducting  fifty-six  (56)  grains  from  the  one 
hundred  and  twenty  (120)  grains  of  camphor  used  in  each  ex- 
periment, gives  a  difference  of  sixty-four  (64)  grains,  which 
must  represent  the  amount  of  camphor  present  in  two  pints  of 
the  officinal  "Aqua  Camphorse,"  being  of  the  proportion  of  two 
grains  in  each  fluid-ounce  of  the  finished  preparation,  or  one 
part  of  camphor  in  two-hundred-and-forty  (240)  parts  of  water. 
Storer's  statement  that  "  water  takes  up  three  times  as  much 
camphor  from  its  intimate  mixture  with  carbonate  of  lime  or 
magnesia  than  when  shaken  with  camphor  alone,  (assuming  it  to 
