ON  HiEMATOXLIN. 
453 
to  give  up  the  hope  which  I  entertained  that  marbled  and  com- 
pact calcareous  stones,  under  the  influence  of  dilute  sulphuric 
acid  and  a  small  quantity  of  hydrochloric  acid,  might  produce  an 
easy  and  regular  disengagement  of  carbonic  acid  without  being 
previously  pulverized,  which  might  have  been  turned  to  useful 
account  by  manufacturers  of  aerated  waters. — Lon.  Ohem.  Graz. 
June  1,  1859,  from  Comptes  Rendus,  April  18,  1859. 
ON  HEMATOXYLIN. 
By  0.  L.  Erdmann. 
The  following  experiments  were  made  by  C.  Hesse  in  Erd- 
mann's  laboratory.  The  hematoxylin  was  prepared  by  Erd- 
mann's  method  by  means  of  aqueous  ether.  By  subsequent 
recrystallization  from  water,  to  which  a  little  sulphite  of  am- 
monia or  soda  is  added,  it  is  obtained  in  perfectly  colorless 
crystals.  These  contain  more  or  less  water  of  crystallization 
as  was  previously  stated  by  the  author.  Crystals  with  a  larger 
quantity  of  water  of  crystallization  were  analysed  ;  the  analysis 
agreed  well  with  the  formula  given  by  Gerhardt,  C32  Hu  O12  -f- 
6H0,— 
Found.       Calculated  from  Frevious  experiments 
C40H17Q15.   C32H14Q12.  ofErdmann. 
C                     63-21        63-67  63-57  63-19  63-62  63-72  63-66  63-17 
H                       4-68         4-51  4-63  4-65    4-70    4-69    4-68  4-70 
C40        015  C32  H14  012 
+  8HO.  +6HO. 
Wta^ionS"}  15'30       16-°3  15'U         16<3T  16'51  16,09 
If  a  solution  supersaturated  at  ordinary  temperature  be  left 
standing,  larger  crystals  are  obtained  in  time  ;  these  usually 
have  smooth  faces  which  are  sometimes  strongly  curved. 
The  crystals  with  a  smaller  quantity  of  water  of  crystalliza- 
tion were  determined  by  Naumann.  They  belong  to  the  rhombic 
system.  The  amount  of  water  found  was  =5-40,  5.53,  5-61 
per  cent.,  the  formula  requires  5-62  per  cent. 
When  hematoxylin  is  treated  with  boiled  solution  of  potash 
in  an  atmosphere  of  hydrogen,  it  is  but  slightly  colored  even  by 
