AAprini,i873™'}   Gleanings  from  the  European  Journals.  163 
Liquor  Ferri  chlorati  is  an  aqueous  solution  of  protochloride  of 
iron,  spec.  grav.  1*226  to  1*230,  containing  10  per  cent,  of  iron. 
Liquor  Uydrargyri  nitrici  oxydulati  s.  Liquor  Bellostii.  Proto- 
nitrate  of  mercury,  100  parts,  is  triturated  with  15  p.  nitric  acid,  and 
885  p.  distilled  water  are  gradually  added.  The  solution  is  altered 
on  keeping. 
Liquor  Kali  arsenicosi,  Fowler's  solution,  is  not  colored,  and  con- 
tains one-ninetieth  of  its  weight  arsenious  acid;  it  is  therefore  about 
one-fifth  stronger  than  the  solution  of  the  U.  S.  Pharmacopoeia,  which 
contains  Tj3  of  arsenious  acid. 
Liquor  Natri  carbolici.  Pure  carbolic  acid  5  parts,  solution  of 
caustic  soda,  spec.  gr.  1*330  to  1*334,  1  part,  distilled  water  4  parts. 
Liquor  seriparus.  Liquid  rennet.  3  parts  of  the  mucous  mem- 
brane of  fresh  calf's  rennet  macerated  for  three  days  in  26  parts  of 
white  wine,  1  part  of  table  salt  being  added. 
Magnesia  citrica  effervescens.  Carbonate  of  magnesia  25  parts, 
and  citric  acid  75  parts,  are  triturated  with  a  little  water  to  a  thick 
pulp,  which  is  dried  at  a  temperature  not  higher  than  30°  C.  (86°  F.) 
14  parts  of  this  powder,  13  p.  bicarbonate  of  soda,  6  p.  citric  acid 
and  3  parts  of  powdered  sugar  are  thoroughly  mixed ;  the  mixture  is 
moistened  with  sufficient  alcohol  and  rubbed  through  a  tinned  iron 
sieve,  so  that  a  coarsely  granular  powder  is  obtained,  which  is  dried 
at  a  moderately  warm  place. 
Magnesia  lactica,  Lactate  of  magnesia,  is  obtained  by  saturating 
lactic  acid,  spec.  grav.  1*24,  previously  diluted  with  10  parts  of  water, 
with  carbonate  of  magnesia  and  evaporating  the  filtrate  to  crystalli- 
zation. 
(To  be  continued.) 
GLEANINGS  FROM  THE  EUROPEAN  JOURNALS. 
By  the  Editor. 
Derivatives  of  vanillic  acid. — P.  Carles  obtained  the  iodated  com- 
pounds of  vanillic  acid*  by  treating  the  aqueous  solution  of  the  latter 
with  an  alcoholic  solution  of  iodine  for  24  hours  at  a  temperature  of 
50°  C,  and  purifying  the  crystals  by  repeated  recrystallization  from 
alcohol.  The  two  compounds  C16H7I06  and  C16H6I206  are  colorless 
and  have  little  odor. 
*See  American  Journal  of  Pharmacy,  1872,  p.  231. 
