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University, giving one lecture daily from Monday to Friday, 
inclusive, from 8:30 to 9:30 A. M. Coincident with this 
work the botanical students of the Summer School enjoyed 
the advantages of the Garden collections in the museum, 
conservatories, and plantations. 
In addition to the summer teaching and the two lectures 
in the spring and autumn courses of the Garden, I have 
given one address before the New York Association of Biology 
Teachers, on ‘*How can Secondary School Teachers of 
Biology Maintain a Spirit of Investigation while Engaged 
in Teaching?” Several papers have been presented before 
various scientific societies, abstracts of which have been pub- 
lished in different periodicals; and published papers include 
four titles, besides numerous reviews and shorter notes. 
On account of the great generosity of Mr. Hugo Lieber, of 
the firm H. Lieber & Co., of New York City, it has been possible 
to continue my studies on the effects of radium rays on various 
plant activities. Several thousand dollars’ worth of reliable 
radium preparations have been at my disposal through Mr. 
Lieber’s interest and liberality, and it has thus been possible 
to carry on for a period of over two years investigations of a 
nature and to an extent otherwise impossible. These experi- 
ments are yet in progress, with special reference to the 
effects of radium rays on unit characters in plants. 
In connection with the radium work, Dr. William H. Parke, 
city bacteriologist, has very kindly placed at my disposal the 
facilities of the laboratories of the city health department, 
and the valuable assistance of members of his staff. 
The experimental pedigreed cultures of the evening-prim- 
roses, conducted at the Garden for several years past, made 
available most valuable material for cytological studies in 
connection with the problems of heredity, mutation, and 
hybridization, and large quantities of this material have been 
collected and prepared for such studies. 
Since the publication of ‘‘ Species and Variations of Bio- 
tian Asters,” by Professor E. S. Burgess, as Volume XIII 
of the Memoirs of the Torrey Botanical Club, Professor 
