268 
M agm  a  M agn  esia. 
J  Am.  Jour.  Phann. 
1       June,  1911. 
B-eucaine  yielded  minute  violet-red  globules,  which  did  not 
crystallize  on  standing,  in  i  per  cent,  solutions  but  not  with  lesser 
concentrations. 
The   crystals  were  examined   under  a   magnification   of  8o 
diameters  in  all  cases^  except  the  A-eucaine  crystals,  which  required 
use  of  a  higher  power. 
Chemical  Laboratory, 
Department  of  Health,  Chicago. 
MAGMA  MAGNESIA.- 
By  S.  L.  Hilton. 
(  Revj sed  Form ula ) 
Magnesium  Sulphate,  U.S.P   350.  Gni. 
Sodium  Hydroxide,    iig.  " 
Gelatin,   150 
Distilled  Water,  q.  s. 
1000.  Cc. 
Dissolve  the  Magnesium  Sulphate  in  400  Cc.  of  distilled  water, 
filter  the  solution  through  paper,  dissolve  the  gelatine  in  50  Cc. 
of  hot  water  and  add  this  solution  to  the  Magnesium  Sulphate  and 
then  wash  the  filter  with  several  portions  of  distilled  water  using 
in  all  not  more  than  250  Cc. 
Dissolve  the  Sodium  Hydroxide  in  400  Cc.  of  distilled  water 
and  when  the  solution  has  cooled  add  300  Cc.  of  distilled  water,  mix 
thoroughly  and  when  both  solutions  have  cooled  to  the  room  tem- 
perature, add  the  solution  of  Sodium  Hydroxide  to  the  solution 
of  Magnesium  Sulphate  by  some  means  that  will  deliver  the  solution 
of  Sodium  Hydroxide  in  rapid  drops.  Stir  the  Magnesium  Sulphate 
solution  briskly  until  all  of  the  Soda  solution  is  added,  then  dilute 
with  distilled  water  to  make  the  mixture  measure  3000  Cc. 
Let  stand  until  the  precipitate  has  settled  to  the  1000  Cc.  mark 
on  the  container,  siphon  of¥  the  supernatant  liquid  and  add  2500 
Cc.  of  water,  stir  well  and  set  aside  to  settle  again  to  the  1000  Cc. 
*  Presented  at  the  April, iqii  meeting  of  the  City  of  Washington  Branch 
of  the  American  Pharmaceutical  Association. 
