546 
Crystalline  Constituents  of 
(  Am.  Jour.  Pharm. 
\       Dec.  1875. 
water  and  adding  an  excess  of  bromine  water  to  the  solution,  a  yellow 
precipitate  was  obtained,  which,  after  two  crystallizations  from  spirit  of 
wine  and  drying  in  vacuo^  gave  the  following  analytical  results  : 
I.  '3537  gram  gave  '4485  of  CO2,  and  -0942  of  H2O. 
II.  '3442  gram  gave,  by  heating  in  a  sealed  tube  with  nitric  acid 
and  nitrate  of  silver,  '3405  of  AgBr. 
Percentages. 
I.  II. 
C  34*57   
H  2-95   
Br    42-09 
Another  specimen  made  by  reversing  the  operation,  pouring  the  so- 
lution of  aloin  into  excess  of  bromine  water,  and  allowing  the  mixture 
to  stand  some  hours  before  collecting  the  precipitate,  gave  results 
which  differ  slightly  from  the  foregoing.  The  proportion  of  bromine 
found  in  this  case  being  somewhat  greater,  and  of  carbon  and  hydrogen 
somewhat  less  than  before. 
The  air-dried  substance  lost  in  this  case  8*22  per  cent,  of  its  weight 
by  exposure  in  a  vacuum  : 
I.  '2769  gram  of  bromozanaloin  dried  in  vacuo  gave  '3458  of  CO  ., 
and  -0670  gram  of  HgO. 
II.  *5970  gave  by  ignition  with  lime  '6043      bromide  of  silver. 
Percentages. 
I.  II. 
c  34-05  — 
H  2-65   
Br    43*06 
Chlorozanaloin. — This  body  was  obtained  by  the  action  of  hydro- 
chloric acid  and  chlorate  of  potassium.  The  crystals  are  bright  yellow 
and  lustrous,  and  closely  resemble  those  of  chlorobarbaloin.  They 
gave  off  13*65  and  14*47  P^^  cent,  of  water  when  exposed  to  a  tem- 
perature of  110°  to  115°  C. 
I.  '3608  gram  dried  at  110°  gave '3644  gram  of  chloride  of  silver, 
II.  '6393  gave  '6496  of  AgCl. 
Percentages. 
I.  II.  Mean. 
CI  24*97  25-12  25-04 
Acetyl-%analoin. — Dry  zanaloin  was  boiled  for  nearly  half  an  hour 
with  about  three  times  its  weight  of  acetic  anhydride.  The  solution 
diluted  with  a  little  alcohol  and  poured  into  water  gave  a  pale  yellow 
