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oe SOCIETY FOR PLANT MORPHOLOGY 123 
cases the old tubers of Anthoceros phymatodes have been found 
sending out new shoots, demonstrating that they play a part in 
the vegetative propagation of the plant, a function which had 
been only inferred in the three tuber-bearing species of 
Anthoceros previously known. 
Morphology of the genus Viola: Wenry Kraemer, Philadel- 
phia College of Pharmacy.— The author has examined style 
and stigma, staminal and corolline hairs, pollen grains, and 
bracts in about thirty species of the genus Viola, chiefly found 
in the United States. 
He distinguishes one group by its nearly globular stigma 
with more or less developed lip-like appendage, style with a 
knee-like bend, and characteristic corkscrew shaped hairs on 
the spurred petal. This group includes V. heterophylla, V. lutea, 
V. tricolor and its varieties. 
The remaining species are subdivided into five groups, accord- 
ing to the length of the nectar-secreting spur of the stamen. 
The influence of electricity upon plants: G. E. Stone, Massa- 
chusetts Agricultural College.— This paper contained the results 
of experiments based upon measurements of about 20,000 plants, 
and was illustrated by a dozen diagrams containing tables and 
Srowth curves showing the manner of response in plants to 
electrical stimuli. A brief outline of the history of electrical 
€xperiments was given, together with a discussion of the imper- 
fections of the me 
menters, 
showing t 
Were pre 
tant results are as follows : (1) Electricity exerts an apprecia- 
ence upon plants. (2) The application of certain 
S of current for a short time (one minute or less) is 
Suffic; é ; 
5 cient to act as a stimulus. (3) Germination and growth are 
oth accele 
Plants q 
of aboy 
Strength 
© Not respond immediately but possess a latent period 
: twenty-five minutes, 7, e., about the same as that for 
tated by electricity. (4) Electrically stimulated — 
oe 
