86  Mercurous  Salts  with  Silver  Salts.  {Am^e°bU!"if9hiarm" 
Bromoform  suitable  for  medicinal  purposes  should  answer  the 
following  requirements:  a  colorless  volatile  liquid  having  a  charac- 
teristic odor  and  a  penetrating  sweet  taste,  specific  gravity  2-86  to 
2  90.  and  should  vaporize  without  leaving  any  residue  at  147 0  to 
150°  C.  A  few  drops  evaporated  from  a  watch  crystal  or  filter 
paper  and  the  vapor  inhaled  should  not  irritate  the  eyes  or  nostrils. 
Agitated  with  sulphuric  acid  no  color  should  be  imparted  to  either 
liquid.  Treated  with  liquor  potassa  no  coloration  should  be  pro- 
duced. On  agitating  with  distilled  water,  the  water  separated 
should  not  show  an  acid  reaction  to  test  paper,  nor  yield  a  precipi- 
tate with  silver  nitrate  nor  on  adding  it  to  a  weak  ammoniacal  solu- 
tion of  silver  nitrate  and  allo  wing  to  stand,  should  a  metallic  mirror 
be  formed. 
INTERFERENCE  OF  MERCUROUS  SALTS  IN  DETECT- 
ING SILVER  SALTS. 
By  Frank  X.  Moerk,  Ph.G. 
Contribution  from  the  Chemical  Laboratory  of  the  Philadelphia  College  of  Pharmacy. — 
No.  83. 
Read  at  the  Pharmaceutical  Meeting,  January  20. 
At  the  November  Pharmaceutical  Meeting  a  note  was  read  on 
the  above  subject,  in  which  the  fact  was  brought  out  that  in  testing 
qualitatively  solutions  containing  silver  and  mercurous  salts,  the 
silver  chloride  was  not  always  dissolved  in  the  ammonium  hydrate, 
and  then  of  course  could  not  be  reprecipitated  on  addition  of  nitric 
acid.  While  this  method  is  not  used  quantitatively,  still  it  is  of 
importance  to  know  under  what  conditions  a  qualitative  test  may 
fail.  In  the  present  paper  approximate  results  are  given  with  the 
following  solutions  of  known  strength  : 
Per  Cent. 
Per  Cent. 
I. 
Ag  NO  3  1    and  H 
II. 
"        1  " 
270 
III. 
"        1  " 
4'05 
IV. 
1 
5"  40 
V. 
1 
{< 
675 
VI. 
1 
<< 
9*45 
VII. 
"        1  " 
r< 
IO'OO 
VIII. 
"  o-2 
«( 
0-27 
IX. 
<<  Q.2 
(i 
1 '35 
X. 
I 
5.40  w 
XI. 
if          j  n 
<( 
IO'OO 
