536  Selections  from  Banish  Journals.  {^'^■^^Z'.l^l!'^' 
to  the  solution  of  sodic  arseniate  before  adding  ferrous  sulphate.  He 
proposes  the  following  formula  for  the  syrup,  taking  the  solution  of  sodic 
arseniate  of  Phar.  Danica  as  basis=(i  part  of  the  solution  in  500  parts 
of  water  equal  to  0*36  arsenic  acid). 
Bt      I.  Solution,  sod.  aiseniatis,  ....     grm.  45*00 
Acid,  citric,  ......  0*05 
Dissolve. 
II.  Ferri.  protosulph.,  ......  0*09 
Aquae  dest.,        .......  5  00 
Dissolve. 
Add  II  to  I  and  afterwards, 
Syrup,  sacchari,  ......  450-00 
M. 
10  grm.  contain  i  mgrm.  ferrous  arseniate. — Ny  Pharm.  Tid ,  1875,  P-  ^95- 
II.  Phosphori'zed  Codllver  Oil. — 0*02  grm.  phosphorus  dissolve  by 
heat  in  30*0  grm.  codliver  oil.^ — A^^  Pharm.  Tid..^  1875,  p.  298. 
Test  for  Aimnonia. — J.  Moddermann  [Viertelj.  f  pr.  Ph.)  observed 
bv  dissolving  sulphate  of  copper  in  sufficient  distilled  water,  that  when 
he  added  more  water  the  previously  limpid  solution  grew  turbid,  with  a 
greenish  hue,  and  that  a  precipitate  of  the  same  color  was  thrown  down. 
Bv  examination  he  found  the  precipitate  to  be  basic  sulphate  of  copper, 
and  the  reason  for  this  to  be  the  presence  of  ammonia  in  the  distilled 
water.  Ammonia  being  present  only  in  minute  quantity,  explains  how 
the  solution  first  is  clear  and  only  by  excess  of  water  gets  turbid.  Sul- 
phate of  copper  is  then  a  very  sensitive  test  for  ammonia. 
(The  same  turbidity  happens  if  neutral  solution  of  chloride  of  iron  is 
largely  diluted  with  water.) — A^'  Pharm.  Tid..^  1875,  p.  326. 
III.  Hydrocyanic  Ac'uL — It  has  hitherto  been  thought  impossible  to 
detect  this  acid  in  the  body  after  some  da)  s  have  elapsed.  SokolofF 
(Ber.  d.  russ.  Ges.)  has  recently  shown  the  possibility  of  detecting  it 
after  twentv-two  davs  had  passed  (in  dogs  having  taken  0*028  grm. 
hydrocvanic  acid).  He  says  that  it  will  not  be  found  in  the  first  distil- 
late of  the  contents  of  the  stomach  with  diluted  sulphuric  acid,  but  it 
will  be  found  in  the  second.  This  seems  to  show  that  hydrocyanic 
acid  does  not  exist  in  the  body  as  a  single  compound,  but  as  a  double 
cyanide,  which  is  not  so  easily  decomposed  by  a  diluted  acid. — Ny 
Pharm.  Tid.^  1875,  p.  325. 
Crystallized  Nitrate  of  Zinc  has  been  recommended  as  a  caustic.  It 
is  treated  similarly  to  sulphate  of  copper  by  melting  it  in  its  own  water 
of  crystallization. 
