526  British  Pharmaceutical  Conference.  {Am'oc0tu)riSarm' 
amount  determined.  This  is  preferably  effected  by  Kjeldahl's  nitro- 
gen process.  Multiplication  of  the  nitrogen  found  by  6 '25  gives  the 
amount  of  albumin  more  correctly  than  direct  weighing.  The  nitrate 
is  made  up  to  500  cc. ;  of  this  50  cc.  or  100  cc.  is  evaporated  to 
about  10  cc,  and  mixed  with  100  cc.  of  a  saturated  solution  of 
ammonium  sulphate  in  the  cold.  The  precipitate  is  filtered  off, 
washed  with  ammonium  sulphate  solution,  dried  and  weighed,  and 
the  ammonium  sulphate  adhering  is  ascertained  by  a  sulphuric  acid 
determination  and  deducted.  Of  the  same  filtrate  50  cc.  or  100  cc. 
is  acidified  with  sulphuric  acid,  and  precipitated  with  a  strongly  acid 
solution  of  sodium  phosphotungstate.  The  precipitate  is'washed 
with  dilute  sulphuric  acid,  and  the  nitrogen  it  contains  is  determined. 
Although  albuminose  and  peptone  contain  less  nitrogen  than  albumin, 
the  same  multiplier  should  be  used,  as  this  will  to  some  extent  com- 
pensate for  the  traces  of  other  nitrogenous  substances  precipitated  at 
the  same  time. 
Salkowski  [Berlin.  Klin.  Wochensch.,  1885,  No.  2),  gives  the  fol- 
lowing differences  between  albumin-peptone,  gelatin  and  gelatin- 
peptone  (a  3J — 5  per  cent,  solution  being  used). 
Albumin- 
peptone. 
Gelatin. 
Gelatin- 
peptone. 
5  vols,  of  glacial  acetic  acid 
and  5  vols,  of  sulphuric 
violet 
yellowish 
yellowish 
An  equal  volume  of  concen- 
trated sulphuric  acid  in 
the  cold  
dark-brown 
yellow 
yellow 
reddish  pp. 
colorless 
colorless 
Solution  boiled  with  \  vol.  of 
nitric  acid  (1'2),  then  made 
alkaline  with  soda  
deep  orange 
lemon-yellow 
lemon-yellow 
BRITISH  PHARMACEUTICAL  CONFERENCE. 
Daring  the  second  week  of  September  the  twenty -sixth  annual  meeting  of  the 
British  Pharmaceutical  Conference  was  held  at  Newcastle-upon-Tyne.  For 
the  following  abstracts  of  the  papers  read  on  this  occasion,  we  are  indebted  to 
the  Pharmaceutical  Journal  and  Iransactions,  September  14. 
Tincture  of  Senna. — Mr.  B.  S.  Proctor  reiterated  an  opinion,  expressed  on 
previous  occasions,  that  the  official  tincture  of  senna  is  an  inert  preparation  of 
