CITRATE  OF  IRON  AND  QITINIA. 
265 
cipitate  appears,  changing  through  green  into  blue,  finally  black  ; 
the  blue  color  lasts  J  to  1  hour. 
Salts  of  chromic  oxide  :  a  yellow  precipitate,  separating  sul- 
phur and  evolving  sulphuretted  hydrogen  ;  the  precipitate  then 
contains  chromic  oxide,  but  no  sulphide. 
Salts  of  protoxide  of  manganium  :  a  yellow  precipitate,  gradu- 
ally increasing  in  bulk,  turning  lighter  and  changing  into  the 
ordinary  sulphide. 
Bichloride  of  tin :  yellow,  liberating  sulphur,  but  not  altering 
the  color. 
Protochloride  of  tin  :  liver-brown,  slowly  becoming  lighter. 
Chloride  of  gold  and  of  platinum  :  yellow,  soon  discolored,  dis- 
solving in  boiling  liver  of  sulphur,  and  reprecipitated  yellow  by 
acids. 
Basic  nitrate  of  bismuth :  dark  yellow,  gradually  brownish 
black. 
Salts  of  antimony :  bright  yellow,  soluble  in  excess,  repre- 
cipitated as  the  orange  colored  pentasulphide  by  acids  ;  the 
original  precipitate  gradually  changes  into  this  with  separation 
of  sulphur. 
Neutral  compounds  of  arsenious  and  arsenic  acid :  yellow,  con- 
taining free  sulphur,  soluble  in  slight  excess. 
Zinc-salts  :  white  or  very  pale  yellowish  ;  after  drying,  straw- 
yellow,  without  separating  sulphur;  composition  of  the  anhy- 
drous =Zn  Sg. 
Cadmium-salts :  light  yellow,  not  decomposed,  consisting  of 
Cd  Sg.  The  color  of  the  dry  precipitate  is  nearly  the  same  as 
the  protosulphide  ;  the  moist  precipitates  are  different. — Ann, 
d.  Chem.  u,  Fh.,  xxxix.,  68 — 75.  j.  m.  m. 
CITRATE  OF  IRON  AND  QUINIA. 
By  Willilm  S.  Thompson. 
Read  before  the  Maryland  College  of  Pharmacy,  Feb.  14th,  1861. 
This  preparation,  though  not  oflBcinal  in  the  U.  S.  Pharmaco- 
poeia of  1850,  has  acquired  considerable  favor  among  physicians 
as  a  remedy  in  which  the  properties  of  both  iron  and  quinia  are 
