NOTE. 



The Committee on Publication insert in this volume of " Transac- 

 tions" all of the Essays which they were enabled to procure. It is to 

 be regretted that even abstracts were impossible of attainment, in some 

 instances, which would do justice to the themes as treated. Such was 

 notably the case with the remarks of Secretary John E. Russell, on the 

 Flora of Central America. 



E. W. L. 

 Hall of Flora, 

 December, A. D. 1881. 



