Am.  Jour.  Pharm. 
July,  1900. 
Investigation  of  the  Tannins. 
335 
In  compiling  these  results  for  publication,  the  writer  has  not 
added  to  the  results,  nor  attempted  to  draw  conclusions  from  them ; 
he  simply  presents  the  results  and  remarks  on  the  materials  as 
gathered  from  Professor  Trimble's  note-books.  Under  the  circum- 
stances of  the  case,  this  is  thought  to  be  best. 
The  writer  was  assistant  to  Professor  Trimble  for  nine  years,  and 
he  would  like  to  assure  every  one,  who  aided  Professor  Trimble  in 
any  way  connected  with  the  materials  upon  which  these  results 
were  obtained,  of  the  sincere  appreciation  in  which  this  aid  was 
held  by  him.  When  known,  the  names  of  those  persons  who  sup- 
plied Professor  Trimble  with  material  are  mentioned  in  connection 
with  the  estimation  of  the  material  furnished. 
The  following  persons  assisted  Professor  Trimble  in  tfi^  chemical 
work :  Calvin  O.  Kinzey,  Griffith  H.  Maghee,  Josiah  C.  Peacock, 
William  E.  Ridenour  and  Florence  Yaple,  and,  since  he  had  ex- 
pressed his  thanks  to  each  of  them  in  published  papers  upon  other 
subjects,  it  is  believed  he  would  have  recognized  their  services  in 
connection  with  the  topics  now  under  consideration. 
The  hide  powder  method  of  estimation  was  used  throughout  the 
work. 
Anacardiacece. — This  section  deals  with  the  more  commonly  used 
species  of  sumach  and  a  material  known  as  ron  ron. 
Rhus  lyphina.—Thz  materials  for  this  work  were  collected  at 
Belmont,  near  Philadelphia,  in  1894.  The  estimations  were  made 
immediately  after  the  collections. 
