342 
Investigation  of  the  Tannins. 
Am.  Jour.  Pfoarm. 
July,  1900. 
Col.,  were  estimated.  The  first  was  collected  in  December,  1896, 
and  the  second  in  February,  1896.    The  figures  were  : 
Sample.  Moisture. 
Klamath  Falls  12*04 
Colorado  Springs  7*65 
Ash  in  Tannin  in 
Absolutely  Absolutely 
Dry  Bark.  Dry  Bark . 
0*91  4*20 
4-56  4*49 
laxus  Canadensis. — Two  samples  of  bark  from  Taxus  canadensis 
were  examined.  One  sample  was  collected  at  Perkiomen,  Pa.,  on 
August  1,  1895,  the  other  was  gathered  in  the  Adirondack  Moun- 
tains, N.  Y.,  on  August  15,  1895.    The  results  were: 
Ash  in 
Tannin  in 
Locality. 
Moisture. 
Absolutely 
Absolutely 
Dry  Bark. 
Dry  Bark. 
io-86 
5*64 
20*46 
10-63 
5'23 
Thuja  Gigantea  and  Thuja  Occidentalis. — For  the  purpose  of 
estimating  the  tannin  in  these  trees,  specimens  were  procured  from 
a  nursery  near  Philadelphia,  on  March  15,  1896.  The  results  were 
as  follows  for  Thuja  gigantea : 
Moisture. 
Ash  in 
Absolutely 
Dry  Material. 
Tannin  in 
Absolutely 
Dry  Material 
5"I4 
10*71 
....  6-93 
6-io 
8-i6 
.  .  .  .8-23 
3'9i 
9-14 
and  for  Thuja  occidentalis: 
Moisture. 
Ash  in 
Absolutely 
Dry  Material. 
Tannin  in 
Absolutely 
Dry  Material. 
....  6-44 
7*12 
577 
.  .  .  .5-61 
6-46 
6-13 
....  7-68 
4-89 
5-85 
The  ashes  of  the  leaves  were  composed  of  potassium  and  calcium 
carbonates  and  phosphates ;  those  of  the  barks  contained  the 
same  salts  and,  in  addition,  sulphates. 
[To  be  continued.') 
Nicotine  maybe  detected  by  the  use  of  formaldehyde  (30  per  cent,  solu- 
tion) and  concentrated  sulphuric  acid.  A  rose-red  colored  solution  is  pro- 
duced with  o'oos  gramme  of  the  alkaloid. — Pharm.  Centralh.,  1899,  p.  703. 
