Am'May^i889arm'}     Gleanings  from  the  German  Journals.  249 
acid,  and  shaking  with  carbon  bisulphide.  The  iodine  can  be  esti- 
mated quantitatively  by  using  to  normal  sodium  thiosulphate  solu- 
tion ;  the  averages  obtained  were  for  pale  oils  0*02  per  cent.,  for 
yellow  oils  0*031  per  cent.  The  acidity  is  determined  by  dissolving 
2-5  grams  oil  in  20  cc.  ether,  adding  15  cc.  alcohol  and  a  few  drops 
phenolphthalein  and  titrating  with  to  normal  potassium  hydrate ;  the 
acidity  of  the  ether  and  alcohol  must  also  be  determined  and  allowed 
for  in  the  test.  The  acid  present  in  one  gram  oil  neutralized  from 
0*002  to  0*0044  gram  KOH.  The  writer  recommends  that  only  cod 
liver  oil  containing  iodine,  and  whose  acidity  does  not  require  more 
than  0*004  gram  KOH  per  gram  oil  be  employed  medicinally. — Hugo 
Andres,  Pharm.  Ztschr.  f.  Kussl.,  1889,  145. 
Mercuric  salicylate  can  be  made  by  precipitation  as  follows :  Dis- 
solve two  grams  mercuric  oxide  in  acetic  acid  diluted  with  a  little 
water  by  application  of  heat,  dilute  to  200  cc,  add  a  solution  of 
sodium  salicylate  (about  3*13  grams)  until  precipitation  ceases,  filter, 
wash  precipitate  with  water  until  washings  are  no  longer  affected  by 
H2S  or  Fe2C]6 ;  yield  three  grams.  The  product  is  a  white  amor- 
phous powder,  soluble  in  solution  of  sodium  chloride. — C.  Goepel, 
Pharm.  Ztg.,  1889,  206. 
Guaiacol  should  constitute  an  oily,  refractive,  when  freshly  dis- 
tilled, colorless  liquid,  of  pleasant  aromatic  odor,  sp.  gr.  1*11  7,  slightly 
soluble  in  water  1:1000,  easily  soluble  in  alcohol  and  ether.  2  cc.  each 
of  guaiacol  and  solution  of  soda  (sp.  gr.  1*30)  evolve  considerable 
heat  when  mixed,  and  on  cooling  form  a  white  crystalline  solid  mass. 
5  cc.  guaiacol,  agitated  with  10  cc.  glycerin  (sp.  gr.  1*19),  should  not 
be  decreased  in  volume.  2  cc.  guaiacol,  4  cc.  benzin,  and  a  few  drops 
of  water,  cause  an  immediate  separation  of  the  guaiacol.  An  aqueous 
solution  with  Fe2Cl6  gives  first  a  yellowish,  afterwards  a  pure  brown 
color.  Three  drops  of  guaiacol,  dissolved  in  5  cc.  absolute  alcohol, 
with  a  very  dilute  Fe2C]6  solution,  gives  first  a  blue  solution,  chang- 
ing at  once  to  green. — (Pharm.  Weekbl.),  Apoth.  Ztg.,  1889,  324. 
Glucose  in  milk  sugar. — To  detect  even  traces,  H.  Will  agitates  for 
one  minute  10  grams  powdered  milk  sugar  with  20  cc.  dilute  alcohol, 
filters  and  heats  to  the  boiling  point,  for  a  few  seconds,  5  cc.  of  the  fil- 
trate with  5  cc.  of  a  solution  made  from  7  grams  cupric  acetate,  87  cc. 
water,  and  3.2  cc.  dilute  acetic  acid  ;  the  test,  in  absence  of  glucose 
remains  clear  on  cooling,  and  after  one  hour's  standing  should  show  no 
deposit  of  cuprous  oxide. — Apoth.  Ztg.,  1889,  324. 
