10 
D2. Fresh-water Microbiology.—A course of lectures, recita- 
tions, and laboratory work on the various organisms found in 
drinking water. Odors, colors, etc., of drinking water; methods 
of microscopical and bacteriological examination. 50 credit hours 
of work. Hours to be arranged. Dr. Olive and assistant. 
D3. Cytology.—A course of lectures and laboratory work on 
cell structure and physiology. Methods of cytological technique, 
and practice in accurate interpretation of cell phenomena. Pre- 
requisite, satisfactory college courses in general botany and plant 
physiology. 100 credit hours of work. Hours to be arranged. 
Dr. Olive and assistant. 
D4. Experimental Evolution.—Detailed studies of the nature 
and causes of variation and heredity. Some of the subjects con- 
sidered are: Historical Résumé 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. e work is primarily in- 
tended for students in pure science, and for agricultural or horti- 
cultural students fitting themselves for various professional ac- 
tivities in these particular fields. Three lectures and two labora- 
tory periods a week. 100 credit hours of work. Hours to be 
arranged. Dr. White. 
D5. Phytogeography.—A course dealing with plant distribu- 
tion over the earth. Prerequisites are courses in plant ecology 
and geology, and a good general knowledge of climatology and 
systematic botany. 50 credit hours of work. Hours to be ar- 
ranged. Mr. Taylor. 
D6. Seminar and Journal Club.—Irregular meetings of the 
Garden Staff and advanced students, for the discussion of funda- 
mental problems of botany or of general biology, and for the 
review of current botanical literature. Open to others on invi- 
tation. 
