28 CARNEGIE INSTITUTION OF WASHINGTON. 



of the periodical animal and meteorological phenomena ; Miss Anne 

 M. L,utz, whose work is partly on the cytological phenomena of 

 heredity and partly keeping the administrative records of the corre- 

 spondence of the station ; and Miss Mabel E. Smallwood, who 

 gives some time to the care of the library. 



The helpers at the station include the following : Lewis Ander- 

 son, mechanician ; John N. Johnson, animal caretaker and janitor ; 

 Thomas K. Kelly, gardener and general helper. These men are 

 serving the station loyally and doing much to advance the work. 



(2) Honorary Associate.- — In recognition of the preeminence of 

 his researches in experimental evolution and in commemoration of 

 his participation in the opening of the station, there has been chosen 

 as honorary associate in perpetuity Dr. Hugo de Vries, professor of 

 botany and director of the botanic gardens. University of Amsterdam. 



(3) Associates. — These are biologists who are either receiving some 

 assistance through a grant directly from the Carnegie Institution in 

 the Department of Experimental Biology for work similar to that 

 done at the station, or receiving aid in their investigations directly 

 from the station. They may be regarded as the non-resident staff 

 of the station. Associates of the station confer with the director 

 from time to time about their investigations in experimental evolu- 

 tion, to the end that there may be mutual understanding of work 

 and avoidance of unnecessary duplication of work. Results of asso- 

 ciates are submitted to the director of the station before publication 

 in a medium mutually agreed upon. Associates are appointed for 

 the calendar year. The following are associates for 1904 : 



Dr. Nathaniel L. Britton, director. New York Botanic Garden. Cooperation 



in experiments in mutation breeding. 

 Dr. William Ernest Castle, assistant professor of zoology. Harvard University. 



Studies in breeding mammals. 

 Dr. Henry Edward Crampton, professor of zoology, Columbia University. 



Selection in Lepidoptera. 

 Dr. Edward Laurens Mark, Hersey professor of anatomy, Harvard University. 



Cytological studies in Mendelian hybrids. 

 Dr. Daniel Trembly MacDougal, assistant director, New York Botanical Garden. 



Mutation in Onagra (Oenothera) ; cooperation in studies on plant mutation. 

 Dr. William J. Moenkhaus, assistant professor of physiology, Indiana Univer- 

 sity. Fish hybridization. 

 William Lawrence Tower, instructor in zoology, the University of Chicago. 



Evolution of the Colorado potato beetle. 

 Dr. Edmund Beecher Wilson, professor of zoology, Columbia University. Cy- 



tolog}' of hybrids. 



(4) Correspondeyits. — These are biologists in the United States and 

 abroad who are engaged in experimental breeding and who have in- 

 dicated their willingness to enter into the relation for the exchange 

 of publications and correspondence upon matters of mutual interest. 



