PROCEEDINGS OF THE CLUB 57 



V. fvmbriatula, V. lanceolata and V. primulifolia," Leader, Mr. David Fables. 

 Attendance 12. 



April 22. New Jersey College for Women. Although the early spring 

 made this a grand day for outdoors, our experiment with the laboratory study 

 of a group, the lichens, was an obvious success. Carefully selected material, 

 very able presentation, interested people, and ample equipment for individual 

 work led all participants to call it a profitable experience. A few Chitrids and 

 other forms were shown by Miss D. Fay. Leader, Mr. G. G. Nearing. 

 Hostess, Miss Hettie Chute. Attendance 16. 



PROCEEDINGS OF THE CLUB 



Minutes of the Meeting of February 6, 1945 



The meeting was called to order by President Seaver at 8 :30 p.m. in Room 

 710 of Schermerhorn Extension, Columbia University. Thirty-eight members 

 and friends were present. The minutes of the preceding meeting were approved 

 as read. 



The scientific program was presented by Dr. H. E. Warmke. His most in- 

 teresting paper was entitled, "Studies on Localization of the Male Determining 

 Gene in Melandrium." The speaker's abstract follows : 



In 2AXXY plants of Melandrium dioicum, the Y-chromosome is found to undergo 

 frequent spontaneous breakage, and thus producing deficiencies of varying lengths. This 

 breakage is believed related to asynapsis of the Y-chromosome, which is high in these 

 stocks. 



In 2AXXY plants gametes with large Y-deficiencies are functional because such defi- 

 ciencies are "covered" by an accompanying X-chromosome. Since the Y-chromosome in 

 this species is known to carry the major male genes, opportunity is thus afforded for 

 studies of number, location, and effect of specific male-determining genes. 



Evidence is now at hand for the presence of at least three distinct genes in the Y-chromo- 

 some of this species important in the development of maleness : one, which suppresses 

 femaleness, is in or near the homologous segment ; one, which initiates the male structures, 

 is near the centromere ; and one, which carries male development to completion, is near 

 the end of the differential arm. 



After considerable animated discussion the meeting was adjourned at 10:05 



p.m. 



Respectfully submitted, 



Frances E. Wynne 



Recording Secretary 



Minutes of the Meeting of February 21, 1945 



The meeting was called to order by President Seaver at 3 :30 p.m. in Room 

 710 of Schermerhorn Extension, Columbia University. Twenty members and 



