DISTRIBUTION  OF  NITROGENATED  COMPOUNDS,  ETC.  323 
the  metals  of  the  earths,  together  with  proofs  on  the  limits  of 
errors  in  the  results  obtained  ;  also  a  critical  analysis  of  the  sci- 
entific material  bearing  on  this  point ;  the  faculty  desires  also  a 
treatise  on  the  query,  whether  the  hypotheses  of  Prout  and  Dumas 
ought  to  be  rejected,  or  whether  the  differences  between  these 
hypotheses  and  the  observations  may  be  explained  by  sufficient 
chemical  or  physical  reasons.  The  essays  must  be  written  in 
the  German,  Latin,  French  or  English  language,  and  handed  in 
by  August  31,  1872.  First  prize  500  thalers,  gold;  second 
prize  200  thalers,  gold. — Ihid.  N.  31. 
The  Petroleum  Industrial  Society  of  Halle  has  offered  two 
prizes  of  5000  thalers  ($3,500)  each,  1,  for  the  discovery  of  a 
chemical  compound  to  purify  crude  paraffia  presscakes  with  little 
loss  (not  over  5  per  cent.),  and,  2,  for  the  discovery  of  apparatus, 
&c.,  for  cooling  quantities  of  paraffin  at  every  season  to  at  least 
5°  C.  (21°  F.)—lbid.  JY.  33. 
ON  THE  DISTRIBUTION  OP  NITROGENATED  COMPOUNDS 
IN  HYOSCYAMUS  NIGER  AND  ALBUS,  IN  DIFFERENT 
STAGES  OF  THEIR  DEVELOPMENT. 
By  Ernst  Thorey. 
Pharmaceutische  Zeitschrift  fUr  Russland,  1870,  p.  129-142, 
publishes  extracts  from  the  inaugural  essay  of  the  author,  from 
which  we  extract  and  condense  some  tables,  showing  the  varia- 
tion of  the  percentage  of  the  nitrogenated  compounds  in  different 
periods  of  the  growth  of  the  plants.  We  give  the  results  only 
for  the  dri/  parts,  and  for  the  minute  analytical  details  refer  to 
the  original.  The  numerous  analyses,  while  on  the  one  hand 
pointing  to  an  intimate  relation  between  some  of  the  nitrogenated 
compounds,  prove  also  the  effect  of  climate  and  soil,  and  show 
the  necessity  of  having  the  leaves  of  henbane  collected  during 
the  early  stages  of  its  growth,  or  until  the  flowers  have  made 
their  appearance. 
Of  the  analytical  processes  employed,  it  must  be  mentioned 
that  the  alkaloid  was  determined  by  Mayer's  test  solution,  the 
nitric  acid  by  Schulze's  modified  method  with  aluminium,  and 
the  ammonia  as  platinochloride  of  ammonium  from  the  distillate 
