Ajt  Jour.  Pharm.  > 
Jan.  1, 1872.  j 
Chromium  and  its  Compounds,  etc. 
79 
fermentation  in  the  stomach,  etc.  I  have  tried  it  myself  and  on  two 
other  gentlemen,  and,  as  far  as  I  can  judge,  it  has  the  desired  eifect, 
— Pharm.  Journ.  and  Trans.,  Dec.  23,  1871. 
€HROMIUM  AND  ITS  COMPOUNDS  IN  THE  ARTS  AND  IN  MEDI- 
CINE. 
By  Dr.  Louis  Feuchtwanger. 
The  following  is  a  brief  abstract  of  an  interesting  lecture  on  chro- 
mium, delivered  before  the  Polytechnic  Club  of  New  York.  It  was 
fully  illustrated  by  specimens  : 
"Chromium  is  a  very  remarkable  metal,  which  is  very  sparingly  dis- 
tributed in  the  earth's  crust.  Chromic  iron  is  the  only  mineral  which 
is  found  in  sufficient  quantities  to  be  useful  as  a  source  of  this  element. 
It  is  found  in  serpentine  rocks,  in  veins  and  disseminated  grains.  It 
is  quite  abundant  in  Siberia,  Styria,  Asia  Minor,  the  Shetland  Islands, 
•Cuba,  and  the  United  States.  The  lecturer  described  the  deposits  of 
[Pennsylvania,  Maryland,  North  Carolina  and  California,  which  he 
ihad  carefully  studied. 
The  constitution  of  Chromic  Iron  is  exhibited  by  the  formula 
*FeO,Cr203  or  (FeO,MgO),  (Al203,Cr203). 
The  following  analyses  exhibit  the  percentage  composition : 
Locality. 
Baltimore,  cryst. 
"  massive. 
Bolton,  Canada. 
L.  Memphramagog. 
Beresof. 
FeO. 
20-  13 
18-97 
35-68 
21-  28 
18-42 
Cr2  Oa. 
60-04 
44-  91 
45-  90 
49-75 
64-17 
Al2  Os. 
11-85 
13-85 
3-20 
11-30 
10-83 
Si02. 
0-83 
Abich. 
Abich. 
Hunt. 
Hunt. 
0-91  Moberg. 
MgO. 
7-45 
9-96 
15-03 
18-13 
6-68 
The  following  minerals  also  contain  chromium  : 
Crocoisite,  PbO,Cr03,  containing  31-3  per  cent,  of  Chromic  acid. 
Melanochroite,  3PbO,2Cr03,  containing  23*3  per  cent,  of  Chromic 
ucid. 
Vauquelinite,  3CuO,2Cr03-f-2(3PbO,2Cr03),  containing  27-9  per 
cent.  Chromic  acid. 
Pyrope,  Bohemian  Garnet,  a  silicate  of  alumina,  iron,  and  magne- 
sia, containing  from  two  to  six  per  cent,  of  Chromic  acid. 
Ouvarovite,  Lime-Chrome  Garnet.  Silicate  of  lime  and  chromium, 
containing  22  per  cent,  of  Chromic  oxide. 
Emerald,  a  silicate  of  glucina  and  alumina,  colored  by  three-tenths 
of  one  per  cent,  of  Chromic  oxide,  according  to  Klaproth. 
