l62 
Canaigre  Tannin. 
Am.  Jour.  Pharm. 
April,  1893. 
"  They  received  some  irrigation,  but  did  not  show  above  ground 
until  October.  During  the  winter  they  grew  steadily,  but  slowly. 
About  March  I,  they  started  into  rapid  growth,  which  continued 
until  flower  and  seeding  occurred  in  April ;  seeds  very  sparingly, 
but  more  plentifully  than  in  native  state.  The  percentage  of  tannin 
has  been  steadily  increasing.  The  roots  now  show  signs  of  sprout- 
ing, and  will  be  gathered  and  replanted.  The  yield  from  this  plot 
was  about  seven  tons  to  the  acre,  but  on  account  of  unfitness  of  soil 
is  not  a  fair  test.  Experiments  on  other  soils  indicate  that  we  may 
safely  expect  fifteen  to  twenty  tons  of  green  roots  per  acre. 
"The  last  samples  analyzed,  August  31,  contained  in  green 
root  66  per  cent,  moisture  at  ioo°  C  ,  16  18  per  cent,  total  extract, 
1  1-46  per  cent,  tannic  acid  (by  hide)  70  98  per  cent,  purity.  This 
would  show  in  the  dry  roots,  which  contain  8  per  cent,  moisture, 
44  66  per  cent,  total  extract,  31  62  per  cent,  tannic  acid  with  70  98 
per  cent,  purity. 
During  the  spring  I  travelled  over  the  Territory  collecting  sam- 
ples.   The  average  from  fourteen  widely  different  parts  showed  (in 
