232 



the autumn in the wood formed the previous spring, and that this is true, 

 also, of other woods, but nothing detinite as to their occurrence or absence 

 is linown. Further investigation is necessary to determine the facts rel- 

 ative to tyloses other than their structure and seemingly haphazard 

 occurrence. 



1. Boulger, G.S. Wood. 1902. 



2. DeBmry, A. Comparative Anatomy, 1884. 



