Harvard 
Summer School 
JULY 5 to AUGUST 13 
1921 
Courses in Elementary Botany, Mor- 
phology, and Plant Anatomy are offered 
by the Harvard Summer School for 
1921, A lirtiited number of research 
students can be accommodated in 
Botany S20a. Correspondence in regard 
to the various courses should be di- 
rected to Professor E. C. JEFFREY, 47 
Lakeview Avenue, Cambridge, Mass., 
until the 5th of Junfe. From that date 
until the opening of the School, in- 
quiries should be addressed to Dr. R. 
E. TORRE Y, Department of Botany, 
Massachusetts Agricultural College, 
Amherst, Mass. Requests for informa- 
tion may also be sent to the Director 
of the Harvard Summer School, 19 
University Hall, Cambridge, Mass. 
UNIVERSITY OF 
COLORADO 
SUMMER QUARTER 
liocatioii: Boulder, CoHorado, at the 
mountain front of the Rockies; en- 
vironment favorable for study, for 
field work, and for outdoor recrea- 
tion. EaSy access to all of the life 
zones from plains to alpine heights 
and glaciers. 
Courses in Botany and Zoology: College 
Botany, Economic Botany, Bacteri- 
ology, Botany of Ornamental Plants, 
Ecology, Local Flora, Forest Botany, 
College Zoology, Natui^e Study. Orni- 
thology, Economic Zoology, Cytology, 
Heredity. 
Other Courses in all usual academic 
subjects. 
Summer quarter of two terms: June 
13 to July 21 and July 21 to August 27. 
Catalogue may be obtained by address- 
ing the Registrar of the University, 
Boulder, Colorado. For any special 
information regarding courses in 
botany and zoology address Professor 
Francis Ranialey. University of Colo- 
rado, Boulder, Colo. 
Our 
Professional Advancement 
Service 
Produces Results 
A recent notiee brought four- 
teen replies in four weeks 
For terms see elsewhere 
irt this issue 
Address 
American Journal of Botany 
Brooklyn Botanic Garden 
Brooklyn, N. Y. 
ECOLOGY 
Devoted to all phasles of 
Ecological Biology 
Official Publication of the 
Ecological Society of America 
Quarterly 
Current, $3.00 a Volume 
Back volumes, $3.50 
Sample Copy on Request 
Address 
ECOLOGY 
Brooklyn Botanic Garden 
Brooklyn, N. Y., U.S.A. 
