24. Experimental Evolution.—Detailed studies of the nature 
and causes of variation and heredity. Some of the subjects con- 
sidered are: Historical Resumé of the Evolution Theory, Physical 
Basis of Inheritance, Inheritance of Acquired Characters, Kinds 
and Causes of Variation, Mendelism, Biometry, Principles and 
* Technique of Plant Breeding. This course is open to students of 
college rank with a knowledge of the elements of physics, chem- 
istry, geology, botany, and zoology. The work is primarily intended 
for students in pure science, and for agricultural or horticultural 
students fitting themselves for various professional activities in 
these particular fields. Three lectures and two laboratory periods 
a week. 100 credit hours of work. Hours to be arranged. 
Dr. White. 
25. Phytogeography.—A course dealing with plant distribution 
over the earth. Prerequisites are courses in plant ecology and 
geology, and a good general knowledge of climatology and system- . 
atic botany. 50 credit hours of work. Hours to be arranged. 
Mr. Taylor. 
26. Seminar and Journal Club.—A biweekly meeting of the 
Garden Staff and advanced students, for the discussion of funda- 
mental problems of botany or of general biology, and for the re- 
view of pertinent botanical literature. Open to others on in- 
vitation. 
Graduate Study and Botanical Research 
27. Research in Plant Physiology.—Independent investigation 
of problems of plant metabolism and irritability. Thesis. 
Dr. Gager. 
28. Research in Mycology and Plant Pathology.—Independ- 
ent investigation of problems in fungi and fungous diseases of 
plants. 
Dr. Olive. 
29. Research in Plant Genetics.—Independent investigation of 
problems of variation and heredity, including that phase of cytol- 
ogy having a direct bearing on the subject matter of genetics. 
Dr. White. 
