DEPARTMENT OF GENETICS. 123 



Correlation Between Physical and Mental Development in Man. 



As a member of the committee for the study of the problem of feeble- 

 mindedness at Letchworth Village, the Director made measurements and 

 other physical observations on 100 idiot boys at that institution. He was 

 assisted by Dr. Govaerts and Miss L. A. Nelson. The superintendent, Dr. 

 Charles S. Little, afforded the investigators every courtesy. The measure- 

 ments thus obtained bear upon the problem of the specific action of endocrine 

 disfunctioning upon development and the inheritance of such disfunctioning. 

 An analysis of some of the data collected has been made by Dr. Bertha E. 

 Martin and is now nearly ready for publication. 



OTHER INVESTIGATIONS. 

 Studies on Physico-Chemical Properties of Vegetable Saps. 



Physico-chemical properties of the tissue fluids of alpine and suhalpine vege- 

 tation. — Work has been continued by Dr. Harris on the data secured by 

 Professor and Mrs. Lawrence (through the courtesy of Professor Clements, 

 who allowed Dr. Harris to utilize his Alpine Laboratory as a base of opera- 

 tions) in the Pike's Peak region. Further determinations have been secured 

 from Mount Nebo, of the Wasatch Range, Utah. 



Physico-chemical properties of the tissue fluids of coastal vegetation. — These 

 studies have been continued by Dr. Harris as opportunity offered, along the 

 lines laid down in the last Year Book of the Institution. Some field work 

 has been done, but attention has been chiefly devoted to analytical work. 



Studies on the physico-chemical properties of the tissue fluids of cereals as 

 grown under dry-farm and irrigation agriculture. — These investigations have 

 been continued by Dr. Harris at the Nephi substation and at the Utah 

 Agricultural Experiment Station, Logan, Utah. The purposes of the investi- 

 gations have been sufficiently outlined in the last Year Book. In 1922, Mr. 

 W. F. Hoffman, Mr. A.H. Johnson, and Mr. R. D. Evans were largely respons- 

 ible for this work under Dr. Harris's direction. 



Studies on the evolution of the Loranthacece and other phanerogamic para- 

 sites. — These studies have been continued, as outlined in earlier reports, as 

 occasion has offered. 



Biometric Methods. 



Dr. Harris, in cooperation with Messrs. Blakeslee and Belling, has com- 

 pleted for publication a set of tables showing the probability that a culture of 

 a given size is capable of producing only individuals of the dominant type. 



Formulae for the determination of the correlation between a variable and 

 the deviation of an associated but not dependent variable from its probable 

 value have been determined and are now in press. 



ADMINISTRATIVE RECORD. 

 Archives op the Eugenics Record Office. 



The care of the archives has been in the hands of Dr. Elizabeth C. Muncey, 

 who was assisted by the Misses Helen Bowen, Helen Brown, and Margaret 

 Martin, as indexers. Owing to the fact that our accumulation of archives is 



