Am.  jour.  Pharm. )         j]xe  Orqano-metallic  Bodies.  621 
Sept.,  1921.       5  y 
Likewise  the  spring  samples  in  most  cases  run  higher  than  the  corre- 
sponding fall  samples,  in  the  cases  of  Salix  Hookeriana  and  Salix 
sitchensis  a  most  notable  difference  was  found. 
Species 
Salix  Nuttallii   
Salix  Hookeriana   
Salix  sitchensis   
Salix  lasiandra  ....... 
Salix  purpurea*  . . .  
Populus  trichocarpa  .  .  . 
Populus  tremuloides  . .  . 
TABLE  OF  ANALYSES. 
FALL  SAMPLES. 
(1)        (2)  Av'g. 
3.887c     3.92%  3.90% 
0.79 
0.84 
0.81 
2.68 
2.92 
2.80 
2.45 
2-55 
2.50 
0.95       0.96  0.955 
3.80        3-74  3-77 
SPRING  SAMPLES. 
(I) 
(2) 
Av'g. 
4A7% 
4-5i%' 
5.18 
5-0O 
5.09 
7.32 
743 
7.38 
2.50 
2.53 
2.51 
378 
3-88 
3.83 
3.83 
3.89 
3-86 
2.42 
2.48 
2.45 
It  might  be  pointed  out  that  there  is  a  large  quantity  of  bark  at 
present  annually  available  at  the  Vancouver  basket  factory.  In  addi- 
tion there  is  a  very  large  supply  of  native  willow  on  the  lower  main- 
land of  the  Province  and  on  Vancouver  Island. 
The  Chemical  Laboratory, 
University  of  British  Columbia,  Vancouver. 
THE  ORGANO-METALLIC  BODIES. 
By  Henry  Leffmann,  M.  D. 
i 
Of  the  many  classes  of  organic  compounds  those  in  which 
metallic  elements  are  joined  directly  to  nitrogen  or  carbon  are  prob- 
ably the  furthest  removed  from  the  what  was  in  earlier  days  con- 
sidered specific  features  of  organic  substances.  Being  all  synthetic 
products,  they  have  been  very  largely  studied  as  matters  of  pure 
science,  but  of  late  years  a  practical  interest  has  attached  to  some  of 
them,  and  research  has  received  an  additional  spur. 
The  first  production  of  an  organo-metallic  compound  seems  to 
have  been  due  to  a  (probably  random)  experiment  in  1760,  when 
Louis  Claude  Cadet  de  Gassicourt,  a  military  apothecary  in  Paris, 
distilled  a  mixture  of  arsenous  oxide  and  potassium  acetate,  and 
*Cultivated  variety  imported  from  Japan  and  planted  on  LuLu  Island 
for  basket-making  trade. 
