20 CARNEGIE INSTITUTION OF WASHINGTON. 



In his personal characteristics Dr. Mayor was distinguished by the 

 ability to give himself unreservedly to support and development of 

 the problems of others. His tact and persuasiveness enabled him to 

 deal effectively with a great variety of difficult conditions encountered in 

 his work in the laboratory and in the field. By reason of desire to give 

 his thought to the advancement of work carried on by other individuals, 

 the organization of the Department of Marine Biology developed along 

 lines somewhat different from those of many other groups of investi- 

 gators. In spite of the great significance of the researches conducted 

 by his many associates in other institutions, the splendid personality 

 and enthusiasm of the Director furnished so large a part of the element 

 of cohesion in the department that the removal of Dr. Mayor presents 

 a problem of great difficulty in considering the possible future of re- 

 search in this field. 



Dr. Mayor is taken from us as a director and organizer and we feel 

 deeply the loss of his immediate personal support and judgment; 

 yet we should not forget that his influence as a constructive student 

 continues as a stimulus operating through the infinite series of contacts 

 which connect the work of others in this time and other times with 

 those movements originating in his life and personality. 



It is with great regret that we make record also of the death of 

 another distinguished contributor to science, Professor J. C. Kapteyn, 



Research Associate in Astronomy with the Carnegie 

 ° Kapteyn 1 . 6 mS Institution, for many years professor of astronomy 



and mechanics at the University of Groningen, and 

 more recently connected with the Leiden Observatory. Dr. Kapteyn's 

 death occurred on June 18, 1922, shortly after his return to Holland 

 from a visit to the United States. Dr. Kapteyn was for fifteen years 

 associated with the work of Mount Wilson Observatory and visited 

 this country frequently for the purpose of collaboration with the 

 members of our staff. He was a source of inspiration to all those who 

 came in contact with him in his researches. Many important investi- 

 gations at Mount Wilson Observatory owe their success in some meas- 

 ure to the influence of Dr. Kapteyn's pioneer studies on stellar motions, 

 and in the future development of fundamental research in this field his 

 work will always have an important part. 



