DIRECTOR S REPORT. 3! 



5. EVENING LECTURES, '1922. . 



Friday, June 30, 



DR. SELIG HECHT "The Visibility of the Spectrum." 



Friday, July 7, 



DR. H. S. JENNINGS "A Critical Study of the So-called 



Linear Theory of Crossing-Over 

 in Inheritance." 

 Tuesday, July 1 1, 



DR. D. H. DOLLEY "Specific Functions and Specific 



Irritability." 

 Friday, July 14, 



DR. GEORGE SARTON "The History of Science." 



Tuesday, July 18, 



DR. E. E. JUST " Certain Effects of Hypertonic 



Sea-water in Activating Arbacia 

 Eggs." 

 Friday, July 21, 



MR. \\'M. LYMAN UNDERWOOD. ."Wild Brother." 



Monday, July 24, 



DR. J. A. DETLEFSEN "Experiments Regarding the In- 

 heritance of the Effects of Rota- 

 tion in Rats." 

 Tuesday, July 25, 



DR. C. B. BRIDGES " Chromosomes and Inheritance in 



Drosophila melanogaster." 

 Friday, July 28, 



DR. G. H. PARKER "Physiology of Actinian Muscle." 



Monday, July 31, 



DR. \V. H. WESTON "Following a Fungus through the 



Philippines." 

 Tuesday, August i, 



DR. \V. H. LEWIS "Tissue Culture." 



Friday, August 4, 



DR. J. R. SCHRAMM "Some Thoughts on Abstracting 



and Indexing Biological Litera- 

 ture." 

 Tuesday, August 8, 



DR. \Y. D. BANCROFT. ."Structural Colors in Feathers." 



