Nineteenth Annual Meeting. 



67 



LOCO WEED. 



like, bearing a rather thick spike of flowers, which have the general structure of the 

 Leguminosse. 



CHEMICAL EXAMINATION. 



In pulverizing the leaflets, the first portion which passes through the sieve con- 

 sists almost wholly of the fine hairs which cause the pubescence to the structure. 

 These hairs seem to constitute about one-third of the weight and over one-half of 

 the bulk of the powder. From its light and spongy structure it is difficult to pul- 

 verize; the dust arising during the operation is irritating to the mucous membrane 



