594 
Am.  Jour.  Pharm, 
Dec,  1882. 
Bismuth  Sabnitrate.  | 
2  cc.  of  the  solution  added  to  10  cc.  of  cold 
Modes  of  Addition. 
water  produced — 
4.  On  slow  addition  a  fine  crystalline  precipitate. 
5.  On  rapid  addition  with  constant  stirring,  a  crystalline  precipitate, 
as  illustrated  in  A. 
6.  Water  was  added,  drop  by  drop,  to  2  cc.  of  the  solution,  until  the 
precipitate  ceased  to  be  redissolved ;  11  cc.  of  water  were  required. 
7 
Bismuth  Subnitrate,  magnified  120  X- 
A,  from  little  cold  water;  B,  in  presence  of  KNO3;  C,  in  presence  of 
Hg.2(NO;j)2;  in  presence  of  Ni(N03)2;  E,  in  presence  of  Pb(N03)2; 
F,  from  much  cold  water;  G,H,  commercial  samples,  elutriated. 
Presence  of  Nitrates. — The  liquid  used  for  precipitating  2  cc.  of  the 
bismuth  solution  consisted  of  10  cc.  of  strong  solutions  of  the  following 
nitrates : 
7.  Ammonium  nitrate;  no  precipitate  after  24  hours. 
8.  Potassium  nitrate ;  feathery  crystals,  illustrated  in  B. 
9.  Barium  nitrate;  fine  mica-like  scales. 
10.  Sodium  nitrate;  amorphous  precipitate. 
11.  Silver  nitrate ;  no  precipitate. 
12.  Mercurous  nitrate ;  crystalline  precipitate,  shown  in  C. 
13.  Nickel  nitrate ;  precipitate  after  24  hours,  crystals  like  D. 
