1 86  Calx  Sulphur ata  and  Potassa  Sulphur  ata.  { Am*ip£i;  f8$2arm: 
tion  the  disagreeable  taste  of  the  commercial  salt  was  not  noticed. 
Estimation  of  the  benzoic  acid  also  proved  it  to  be  anhydrous. 
From  this  investigation  it  may  be  concluded  that  the  commercial 
salt,  as  ordinarily  prepared  by  crystallization,  is  of  variable 
strengths,  and  that  to  insure  uniformity  it  should  be  made  anhy- 
drous; also  that  the  benzoic  acid  sublimed  from  benzoin  gives  a 
much  more  palatable  compound  than  that  made  synthetically  from 
toluol. 
CALX  SULPHURATA  AND  POTASSA  SULPHURATA. 
By  Wm.  G.  Kleinstuber,  Ph.G. 
Abstract  from  a  Thesis. 
Calx  sulphur  ata. — The  formula  of  the  U.  S.  Pharmacopoeia  directs 
the  preparation  of  sulphurated  lime  from  100  parts  of  lime  and  90 
parts  of  sulphur ;  the  reaction  taking  place  may  be  represented  by 
the  equation  J3CaO  -f  io52  =  8CaS  -f-  CaS3  -f-  3CaS203  -j- 
CaSQ4;  and  if  no  loss  occurs  this  would  account  for  more  than  36 
per  cent,  of  calcium  sulphide  required  by  the  pharmacopoeia.  A 
fresh  specimen,  prepared  by  the  pharmacopceial  formula,  and  five 
commercial  specimens,  were  examined  by  the  process  of  the  phar- 
macopoeia, boiling  I  gm.  with  1-25  gm.  of  crystallized  copper  sul- 
phate in  50  cc.  of  water  ;  in  case  the  filtrate  contained  copper,  its 
amount  was  determined  by  precipitation  with  KHO,  igniting  and 
weighing  as  CuO.    The  following  results  were  obtained  : 
Found. 
CaS 
Color  of  specimens. 
CuO 
CuS 
Per  ct. 
0-441  gm. 
26 
0*302  " 
22-76 
0-283  " 
21-31 
0-145  " 
8-84 
0-093  " 
6-98 
0-088  " 
6-63 
Potassa  sulphurata. — If  the  reaction  occurring  in  the  pharma- 
copceial process  be  expressed  by  the  equation  3K2COs  -f  4S2  = 
2K2S3  -(-  K2S2Os  -{-  3C02,  the  quantity  of  sulphur  directed  should 
be  increased  from  1  to  1-23  parts.1    Working  by  the  pharmacopceial 
1  In  this  calculation  no  notice  is  taken  of  the  water  and  impurities  ;  the 
U.  S.  P.  requires  Potassii  carbonas  to  contain  not  less  than  81  per  cent,  of 
K2C03.— Editor. 
