540 Wisconsin Academy of Sciences , Arts , a?ic£ Letters. 
on ten cotyledons and eight leaves. Conidia obtained from 
these infected plants produced infection on varieties of 
Cucurbita pepo, Cucumis sativus and Lagenaria vulgaris. 
RESULTS WITH THE PUMPKIN AND ORNAMENTAL GOURDS, CU¬ 
CURBITA PEPO LINN. (TABLE III). 
Several distinct types of cucurbits, differing mainly in the 
character of the fruit, belong to this species. It contains the 
different varieties of the so-called pie pumpkins and also the 
field pumpkins. The summer crookneck or warty squashes 
with white or yellow J-shaped fruits, and the ornamental 
gourds with small, very hard-shelled fruits of many shapes, 
as the apple-shaped, egg-shaped, etc., are also varieties of this 
species. 
Table III shows that eight experiments were made in which 
four different varieties of pumpkins were inoculated with 
conidia from various cucurbits. Hine foliage leaves were 
inoculated, all of which became infected. Out of eighteen 
cotyledons inoculated, all but two became infected. 
All these varieties of pumpkins seemed to be as susceptible 
to the mildew as were the squashes and, as is shown, were 
readily infected by conidia from squashes, the mildew being 
thus transferred from one species to another. 
Several kinds of ornamental gourds belonging to this same 
species ( C. pepo Linn.) were also tested as to their capacity 
for infection. The mock orange gourd was used in seven ex¬ 
periments, fifteen cotyledons and ten leaves being inoculated. 
All of these became infected, except five cotyledons which 
died before the mildew had a chance to develop. 
The apple-shaped and the egg-shaped gourds were also used, 
seven experiments being made with these two varieties. All 
of the inoculated leaves and cotyledons were readily infected. 
As conidia from squashes, cucumbers, pumpkins and the bot¬ 
tle gourd were used in these experiments, it is plain that various 
varieties of both gourds and pumpkins can readilv be infected 
with the mildew from the squash, a different species, and from 
