Nos. 45I-452-] AXATOMV OF THE COATFK 



obliteration of such structures, which is full 

 36.4 of all the species as represented by 

 fraseri, A. lasiocarpa, A. vcitchi. This last f 

 is wholly typical of Tsuga {YV^. 42), in which 

 resin cells than those on the outer face of 

 Finally, in Picea and Pinus, there arc no so 

 any of the situations described, since thc\' ha 

 replaced by highly organized resin passages 

 that the distribution of the resin cells prcs 

 which bear a direct relation to the organizatio 

 as the latter eventually replace the former, 

 appear somewhat more clear from the follow' 



