Am.  Jour.  Pharm. 
June,  1896. 
}        The  Pharmacopceial  Standard.  303 
class  c. 
(1)  Calx  Chlorata  (Chlorinated  Lime.) 
"A  compound  containing  not  less  than  35  per  cent,  of  available 
chlorine."— U.  S.  P.,  1890.  . 
Two  samples  of  commercial  chlorinated  lime  (A  and  B)  are 
reported  as  showing  the  probable  variations  in  this  substance: 
Available  Chlorine. 
Per  Cent.  Per  Cent. 
(A)  October  11,  1895,  average  20*51  (20*45  and  2°*57) 
(B)  May  8,  1896,  average   31*47  (31*22  and  31*72) 
While  pharmacopceial  chlorinated  lime  should  seemingly  be  easily 
obtained,  the  writer  has  experienced  difficulty  in  getting  it  of  any- 
thing like  a  uniform  quality,  and  probably  this  is  the  experience  of 
others. 
(2)  Calx  Sulphur ata  (Sulphurated  Lime.) 
"  A  mixture  containing  at  least  60  per  cent,  of  calcium  monosul- 
phide  (CaS  =  71-69)."— U.  S.  P,.  1890. 
By  applying  the  tests  indicated  in  the  U.  S.  P.  to  two  samples  from 
two  different  manufacturers,  the  following  results  were  obtained  : 
A  contained  less  than  30  per  cent,  of  CaS. 
B  contained  more  than  30  per  cent.,  but  less  than  45  per  cent, 
of  CaS. 
In  this  direction  it  may  be  said  that  all  attempts  to  obtain  this 
preparation  of  pharmacopceial  quality  were  ineffectual.  Indeed,  one 
authority  stated  that,  owing  to  danger  from  spontaneous  combus- 
tion, no  effort  would  be  made  to  produce  it.  The  fact  remains, 
the  increase  of  the  pharmacopceial  requirements  has  not  resulted  in 
an  increased  valuation  of  the  preparation. 
(3)  Caustic  Potash. 
-90  per  cent.  KOH."— U.  S.  P.,  1890.1 
Efforts  were  made  to  secure  caustic  potash  which  would  meet  the 
requirements  of  the  U.  S.  P.,  and  the  following  results  were  obtained  : 
1  The  U.  S.  P.,  1890,  gave  no  standard  for  caustic  potash  sticks.  The  present 
U.  S.  P.  standard,  established  1880,  conforms  also  to  the  German  Pharmaco- 
poeia, 3d  edition. 
