514  Gleanings  from  the  German  Journals,  {^^'olu\m^^^ 
ceptible ;  if  the  preparation  is  mixed  with  a  large  quantity  of  water 
the  iodoform  odor  becomes  prominent. — Rdsch.,  1888,  640. 
Test  for  Glycerin. — The  property  of  glycerin  to  displace  boric  acid 
in  borax  is  used  in  the  following  manner  :  The  solution  to  be  tested 
and  a  solution  of  borax  are  slightly  colored  by  addition  of  a  few  drops 
of  litmus  solution  and  the  two  blue  liquids  mixed ;  in  presence  of 
glycerin  the  liquid  is  reddened,  owing  to  the  liberation  of  boric  acid. 
The  red  color  on  heating  becomes  blue,  but,  on  cooling,  reappears. — 
Pharm.  Post,  1888,  487. 
Ferrum  Peptonatum. — 75*0  fresh  egg  albumen  (lO'O  dried)  are  dis- 
solved in  1000*0  distilled  water ;  to  this  is  added  18*0  hydrochloric  acid 
and  0'5  pepsin,  and  digested  at  40°  until  a  portion  produces  only  a 
faint  turbidity  with  nitric  acid ;  allow  to  cool,  neutralize  with  soda 
solution,  strain  and  mix  the  liquid  with  120.0  solution  of  oxychlor- 
ide  of  iron  and  1000*0  distilled  water.  The  fluid  is  now  exactly  neu- 
tralized with  diluted  soda  solution,  and  the  precipitate  washed  by  de- 
cantation  with  distilled  water  until  the  washings  produce  no  turbidity 
with  silver  nitrate.  The  precipitate  is  collected  on  a  wet  linen 
strainer,  drained,  placed  in  a  porcelain  capsule,  ]-5  hydrochloric  acid 
added  and  heated,  with  stirring,  on  a  water-bath  until  a  clear  solution 
results,  which  is  concentrated,  spread  upon  glass  plates  and  dried  at 
20°  to  30°,  to  yield  a  scale  preparation,  or  from  which  is  made 
Liquor  Ferri  Peptonati  by  diluting  with  distilled  water  to  900*0 
and  adding  100*0  spirit  of  cogmc. 
The  so-called  "  Indifferent  Iron -preparations,"  to  which  class  the 
above  belongs,  are  very  sensitive  towards  carbonic  acid  and  sodium 
chloride,  and  in  their  manufacture  it  is  essential  to  work  as  rapidly  as 
possible,  and  to  use  distilled  water,  which  has  been  heated,  to  expel 
CO2  and  again  allowed  to  cool. — E.  Dieterich,  Pharm.  Centrlh.,  1888, 
316. 
Peptone  is  pronounced  by  Palm  (Ztschr.  f.  An.  Chem.)  to  be  a  solu- 
tion of  albumen  in  acids.  The  action  of  lactic  acid  upon  various  albu- 
mens is  to  form  peptone.  This  is  also  produced  by  the  action  of  the 
same  acid  upon  glue,  chondrin  and  fibrin.  By  adding  ether  to  an  alco- 
holic peptone  solution,  a  peptone  of  constant  composition  is  separated  as 
an  oily  mass,  which  contains  the  lactic  acid  and  protein  in  stoechiomet- 
rical  proportions.  Albumen  may  be  reprecipitated  from  peptone  solu- 
tions by  neutralizing  the  acid  and  adding  95  per  cent,  alcohol ;  alco- 
hol acidulated  with  sulphuric  acid  will  likewise  precipitate  the  albu- 
