3) 
damental principles which underlie and point the way to labora- 
tory and field work. 5 successive Saturday mornings at 9 o'clock, 
beginning Oct. 24. Dr. Gager. 
19. PRACTICAL GARDEN Work: A summer’s work with children 
in a garden under supervision. This work may be done at the 
Brooklyn Botanic Garden, or its equivalent in some children’s 
garden, the work of which is acceptable to the Botanic Garden. 
Advanced Courses and Investigation 
For the following advanced and research courses there is a 
charge covering all expenses, including laboratory fee, of $30 for 
a full course of 100 credit hours, and $20 for a half course of 50 
credit hours. 
ADVANCED COURSES 
20. MycoLocy AND PLant PatHotocy: Morphology and path- 
ology of the fungi and bacteria. Life histories of fungi; methods 
of control of plant diseases, etc. Prerequisite, a satisfactory col- 
lege course in general botany. i100 credit hours of work. This 
course alternates with course 22. Offered in the spring of 1914. 
Hours to be arranged. Dr. Olive and Mr. Bisby. 
21, FReSH-WaATER MicropioLocy: 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 offered in the fall of 1914, beginning in September. 
Hours to be arranged. Dr. Olive and Mr. Bisby. 
22. CytoLocy: A course of lectures and laboratory work on cell 
physiology and cell morphology. Methods of cytological tech- 
nique, and practice in accurate interpretation of cell phenomena. 
Prerequisite, satisfactory college courses in general botany and 
plant physiology. 100 credit hours of work. This course alter- 
nates with course 20. Offered in the fall of 1914, beginning in 
September. Hours to be arranged. Dr. Olive and Mr. Bisby. 
23. 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 

