8 CARNEGIE INSTITUTION OF WASHINGTON. 



forwarding of his epoch-making studies in experimental evolu- 

 tion. We have cooperated also with Dr. Thomas B. Osborne, of 

 the Connecticut Agricultural Experiment Station, and Dr. L. B. 

 Mendel, of Yale University, in their exceedingly important inves- 

 tigations of the vitamins, which are [playing so significant a 

 role in fundamental biological research and in investigations of 

 nutrition. 



Similar arrangements with Dr. A. A. Michelson, of the Uni- 

 versity of Chicago, and Dr. H. N. Russell, of Princeton Univer- 

 sity, have brought into association with the staff of Mount 

 Wilson Observatory investigators whose recent contributions 

 rank among the foremost results in the phj^sical sciences. 



In still another field of separate research lies the work of Dr. 

 John F. Hayford, of Northwestern University, whose studies 

 upon the physical factors determining the water-level of the Great 

 Lakes have taken high rank among researches advanced toward 

 completion within the past year. 



The formulation of results of the Institution's work is repre- 

 sented in part by the series of Carnegie Institution publications, 

 „ ,,. ,. , but in a large measure the work of the Depart- 



Publication and ^ , . . 



Distribution of meuts and Associates is issued through many 

 other publications established for needs of inves- 

 tigators in special subjects. A survey of the list of works 

 issued by the Institution presented on page 17, compared 

 with the bibliography of the members of the staff on pages 18 

 to 27, will indicate that certain of the departments ver}^ largely 

 use channels other than our own publications. This dif- 

 ference in distribution occurs bj^ reason of the fact that the 

 results in some subjects may be expressed in such form as to fit 

 easily into special journals, whereas other types of work are 

 presented more effectively in the form of monographic volumes. 

 Thus, for example, the papers of the Geophysical Laboratory 

 appear largely through the American Journal of Science, the pub- 

 lications of Mount Wilson Observatory are issued in considerable 

 part in the Astrophysical Journal, while many of the results com- 

 ing from the Department of Terrestrial Magnetism are printed 

 in the journal Terrestrial Magnetism and Atmospheric Elec- 



