140 BOTANICAL GAZETTE [FEBRUARY 
A comparative account was given of the development of ovule, embryo 
sac, antipodal cells, funicle, and suspensor. 
J. B. Pottock: The stimuli that cause the so-called “peg” or “heel” on 
Cucurbita seedlings. 
No abstract furnished. 
W. C. COKER: On the prothallus of Taxodium distichum. (By invitation.) 
The development of the embryo-sac, archegonia, endosperm, polli- 
nation, development of the male pro-nuclei, fertilization, and develop- 
ment of the pro-embryo are described in full. 
A. W. Evans: A new type of branching in the leafy Hepatica. (By 
invitation.) 
The terminal branching in this group, according to Leitgeb, always 
Occurs in the ventral half of one of the lateral segments cut off from 
the apical cell. In Mastigobryum integrifolium Aust. of the Hawaiian 
islands, however, it occurs in both lateral and ventral segments, show- 
ing that it is much less restricted than hitherto supposed. 
E. B. Copetanp: The geotropism of split stems. (By invitation.) 
Numerous experiments by the author show that if a stem be split 
into two equal halves lengthwise and then placed horizontally the rate 
of growth of the lower half is accelerated and of the upper depressed. 
This of course occurs in an uncut stem, but this result shows that there 
is No necessity for assuming a transverse transmission of the stimulus, 
as has hitherto been held. The paper will be published in full in the 
BoranicaL Gazette. 
Harriet B. Winsor and W. F. Ganonc: Some variations and correla- 
tions in the leaves of trees. 
The authors presented the results of an attempt to apply statistical 
methods to the study of an ecological problem, namely the influences 
determining the length of the petiole and the shape of the leaf. Trees 
were selected, and measurements made upon five hundred specimens 
of leaves from different positions and the results plotted in curves. 
The paper was offered as an illustration of method, and the studies 
are to be continued. 
J. M. MacrarLane: Perennation in the stem of Lycopodium alopecuroites. 
The author showed that the branch in this species dips into 
ground in autumn by geotropic growth. This part becomes colorless; 
