70 



of what it would mean to develop a variety of commercially 

 valuable wheat that would flourish on the arid plains of the 

 western United States. Mr. Aaronsohn added also many in- 

 teresting details as to other features of the work of the Jewish 

 Agricultural Experiment Station, the funds for the support of 

 which are supplied chiefly by Jewish citizens of the United States. 



Of great interest to plant breeders are the remaining Jesup 

 lectures on heredity and sex by Prof. T. H. Morgan, of Columbia. 

 They are held at the American Museum of Natural History, at 

 77th Street and Central Park West, on Wednesday evenings, 

 as follows: March 5 — The Effects of Castration and of Grafting 

 on the Secondary Sexual Characters; March 12 — Parthenogenesis 

 and Sex; March 19 — Inbreeding and Fertility; March 26 — • 

 Special Cases of Sex Inheritance. 



During the coming summer the University of Minnesota, 

 under the direction of Prof. F. E. Clements, is to conduct a 

 graduate school of ecology at Minnehaha-on-Ruxton, Manitou, 

 Colorado. Others on the staff will be Raymond J. Pool, M.A., 

 assistant director, Edith Clements, Ph.D., instructor in botany, 

 H. L. Shantz, Ph.D., special lecturer. The Alpine Laboratory 

 is situated at 8,500 ft. on the Cog Railway between Manitou 

 and the summit of Pikes Peak. The flora is both rich and varied, 

 and in connection with the remarkable diversity of habitat, 

 found in this rugged mountain region, offers exceptional oppor- 

 tunities for the study of plant response, and the origin of new 

 forms. Among the alpine summits of the continent. Pikes 

 Peak is unique in the series of great formational zones which 

 lie across its face. From the Great Plains grasslands, the series 

 runs from valley woodland at 5,800 ft. to mesa, chaparral, foot- 

 hill woodland, pine forest, aspen woodland and spruce forest to 

 alpine meadow, rock field and bog at 11,000-14,000 ft. in a 

 distance of 7 miles. From the very nature of the mountains, 

 weathering, erosion and other physiographic factors bring about 

 the almost countless repetition of the same or similar habitats, 

 and produce numbers of primary and secondary successions 

 illustrating a wide range of developmental processes and prin- 



