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MISSOURI BOTANICAL GARDEN BULLETIN 15 
L. P. Jensen, October 24, before the Women’s Club of 
Greenfield, Illinois, ‘‘The Use of Native Materials in Orna- 
mental Planting.’’ 
L. P. Jensen, November 2, before the Boy Scout Class 
for the Merit Badge, at the Cabanne Branch Library, ‘‘ For- 
estry.”’ 
George T. Moore, November 13, broadcasted from the Post- 
Dispatch radio station, ‘‘The Growing Interest in Flower 
Shows.”’ 
B. M. Duggar, December 1, before the Phi Sigma Society, 
‘‘Science, an After-Dinner Attitude.’’ 
B. M. Duggar, December 28, before the physiological section 
of the Botanical Society of America, at the meetings of the 
American Association for the Advancement of Science, at Cin- 
einnati, ‘‘Cell Activity and H-lon Concentration—Some Prob- 
lems in Metabolism and Absorption.”’ 
B. M. Duggar and Joanne K. Armstrong, December 28, be- 
fore the American Naturalists, ‘‘Ultra-filtration as a Means of 
Studying the Life Cycles of Bacteria.’’ 
J. M. Greenman, December 29, before the systematic section 
of the Botanical Society of America, ‘‘Age and Area with 
Special Reference to the Flora of Tropical America.”’ 
Graduates, Fellows, and Investigators—Laboratory or ex- 
perimental research has been conducted, as heretofore, by 
members of the scientific staff of the Garden; graduate stu- 
dents, especially those registered as candidates for degrees in 
the Henry Shaw School of Botany of Washington Univer- 
sity ; and special investigators doing cooperative or independ- 
ent research. 
Graduate students.—During the calendar year the follow- 
ing graduate students have been in residence: A. F. Camp, 
C. C. Epling, Grace Gilmor, Adele L. Grant, Marian A. Grif- 
fiths, Mary E. Hopper, Grace E. Howard, Mildred L. John- 
son, L. J. Klotz, S. G. Lehman, Christine F. Posse, Fanny 
Fern Smith, Louise M. Stupp, L. E. Tisdale, 8. R. Warner, 
and H. C. Young. In addition, the research laboratories are 
also utilized by Dr. Joanne K. Armstrong (research assistant), 
Dr. G. M. Armstrong (assistant professor of botany in Wash- 
ington University), Dr. G. W. Freiberg (instructor in botany 
in Washington University), Dr. Nellie M. Carter (research 
