NATIONAL ACADEMY BIOGRAPHICAL MEMOIRS VOL. VI [ 



1909. 



Are heredity and variation facts? Address at 7th International Zoolog- 

 ical Congress, Boston, 1907 ; also reprinted as a memorial publica- 

 tion. 



UNPUBLISHED WORKS. 



The axis of symmetry of the ovarian egg of the oyster. In press 1905, 



but still in MSS., not published. 

 An extensive work on Salpa. 

 Lowell Lectures. 



