AmNo°vU"-I87h6!rm- }      Solubility  of  Iodide  and  Bromide.  .49 1 
a  liniment,  which  is  applicable  in  cases  similar  to  those  in  which  vola- 
tile limiment  is  used  : 
Take  of  Castile  soap,  .  .  ^iss 
Water  of  ammonia,    .  .  f^iss 
Camphor,  .  .  £vi 
Oil  of  turpentine,      .  .     f  £vi 
•  Chloride  of  ammonium,  .  ^iss 
Water,  .  .  .  f^xii 
Dissolve  the  soap  shavings  in  one-half  the  water  previously  mixed  with  the  am- 
monia, and  the  ammonium  chloride  in  the  other  half ;  mix  the  solutions  well,  and  add 
the  camphor  dissolved  in  the  turpentine  ;  then  agitate  briskly  until  the  liquids  are 
united  and  form  a  perfect  emulsion. 1  Other  active  medicines  may  be  added  when 
indicated. 
SOLUBILITY  OF  IODIDE  AND  BROMIDE  OF  AMMONIUM  IN 
ETHER. 
BY  E.  M.  WELLS,  PH.G. 
During  an  investigation,  I  observed  that  iodide  of  ammonium  is  sol- 
uble in  ether.  Being  desirous  to  know  the  extent  of  its  solubility,  I 
examined  several  standard  works,  but  found  nothing  written  on  the 
subject.  "  Gmelin's  Chemistry"  (edition  1872)  merely  states  that  the 
salt  is  very  deliquescent  and  easily  soluble  in  water  and  alcohol,  and 
similar  statements  are  met  with  in  other  works. 
From  the  results  of  the  determinations  as  given  below,  it  seems  that 
both  iodide  and  bromide  of  ammonium  are  not  insoluble  in  pure  ether^ 
and  that  their  solubility  increases  very  considerably  as  the  ether 
becomes  weaker  through  the  presence  of  alcohol. 
An  excess  of  the  respective  salts  was  put  into  a  flask  with  a  quan- 
tity of  ether,  and  allowed  to  stand  several  hours,  and  was  well  shaken 
at  short  intervals.  The  temperature  was  from  6o°  F.  to  650  F.  The 
ethereal  solutions  were  carefully  poured  in  a  tared  beaker,  well  covered 
and  weighed,  then  set  aside  to  evaporate  to  dryness  and  re-weighed. 
The  results  of  the  several  experiments  are  given  in  the  following 
table  : 
Grs.  of  Ether, 
sp.  gr.  -715. 
Grs.  of  Ether, 
sp.  gr.  -742. 
Dissolved  grs.  Iodide 
of  Ammonium. 
Dissolved  grs.  Bro- 
mide of  Ammon. 
Per  cent. 
•218 
•5 
•22 
'225 
Amount  very  small 
'345 
9 
2'6o 
•249 
•5 
•20 
1  For  a  formula  for  a  similar  preparation  see  "Am.  Jour.  Phar.,"  1875,  P-  257  — " 
Editor. 
