486  American  Pharmaceutical  Association.     { A™ cSer Pi904rm' 
The  Quinhydrone  Hypothesis  of  Plant  Pigmentation. 
By  E.  Kremers. 
This  paper,  presented  in  abstract  by  the  author,  embodies  a  study 
of  plant  pigments  with  a  view  of  showing  their  probable  relation- 
ship. 
On  the  Curing  of  Leaf  Drugs. 
By  R.  H.  True  and  Mr.  Stockburger. 
Presented  by  W.  O.  Richtmann,  of  the  Bureau  of  Plant  Industry. 
The  authors  of  this  paper  believe  that  leaf  drugs  are  largely 
bought  on  their  physical  appearance.  This  appearance  is,  there- 
fore, an  important  factor  to  be  sought  in  this  class  of  drugs. 
The  writers  discuss  the  probable  changes  that  take  place  in  the 
coloring  matter  of  plants,  and  also  suggest  methods  of  preventing 
undesirable  changes  in  color  in  the  drying  of  leaf  drugs. 
The  report  of  the  committee  on  the  Chairman's  address  and  on 
the  report  and  recommendations  of  the  committee  ©f  the  section 
was  then  read  by  Professor  Koch,  of  Pittsburg. 
Chemical  Reagents. 
By  Lyman  F.  Kebler. 
This  paper  embodies  the  results  of  the  analysis  of  a  number  ot 
chemical  reagents  supplied  the  Bureau  of  Chemistry,  and  empha- 
sizes the  importance  of  not  depending  on  labels. 
A  Preliminary  Report  on  the  Presence  of  Nitrogen  and 
Nitrates  in  Medicinal  Plants. 
By  Lyman  F.  Kebler. 
Contains  a  preliminary  announcement  of  a  proposed  study  on  the 
economic  value  of  the  presence  of  fixed  nitrogen  in  solanacecus 
plants. 
Notes  on  the  Methods  of  Detection  of  Adulteration  in 
Olive  Oil. 
By  L.  M.  Tolman. 
This  paper,  presented  by  Lyman  F.  Kebler,  contains  a  iesume  ot 
the  most  useful  tests,  at  present  available,  (or  detecting  common 
adulterants  of  olive  oil. 
