(45) 
account of these observations and of their significance is pub- 
lished in the Journal of the Garden for December, 1907. 
The minimum temperature recorded for the year was — 2°, 
on February 6, and the maximum temperature 93° on July 
8,18 and 25. The mean temperature for the year was, 
therefore, 45.50”. While the spring season, taken as a whole, 
was unusually cold and “late,” the month of April was ex- 
ceptionally warm, having a mean temperature of 48°, or 
4.30 above the normal temperature for April for New York 
State. The total precipitation recorded was 47.01 + inches. 
The first fall frosts occurred during the first week in October. 
On October 3 luncheon was served in the Morphological 
Laboratory to the members of the Horticultural Society of 
New York and their guests. Covers were laid for about 
fifty persons, and the room was decorated with potted plants 
and cut flowers from the Conservatories. 
Early in December, circular letters were sent to all students 
who have been in residence at the Garden since its founda- 
tion, asking for information to be utilized in the compilation 
of complete academic records of such persons. This work 
cannot be completed until next year. 
My own investigations during the year have been devoted 
mainly to a continuation of researches on the effects of 
radium-rays on planis. Guarded pedigreed cultures of the com- 
mon evening primrose (Oenothera biennis) grown from seeds 
formed after an exposure of one or both germ-cells to radium- 
rays, have been carried through the first generation after 
exposure and interesting results recorded. The full signifi- 
cance and interpretation of these results can be ascertained 
only after the growth of the second generation during the 
coming year. The effects of these rays on indirect nuclear 
division, or mitosis, and on tropistic movements of plants 
have been studied, and reports of all three of the above lines 
of research were presented at the meetings of the American 
Association for the Advancement of Science, and affiliated 
societies, at Chicago, in December. Ten minor papers 
have been published during the year, in addition to sev- 
