Reed—Infection Experiments with Mildew. 541 
the cucumber and bottle gourd, which belong to different genera. 
All of these varieties of C. pepo, whatever the source of the 
conidia, seemed equally susceptible to the mildew. 
RESULTS ON THE BOTTLE AND DIPPER GOURDS, L AGE N ARIA VUL¬ 
GARIS SER. (TABLE IV). 
So far as I am aware, no mildew has ever been reported 
upon this species, although it is very commonly cultivated with 
other cucurbits on account of its peculiarlv shaped fruits. 
Seven experiments were made to determine whether the mildew 
from various cucurbits would infect it, the bottle gourd being 
used in four experiments and the dipper gourd in three. As 
seen from the table, the plants were inoculated with conidia 
from cucumbers, squashes, the apple-shaped gourd and the bot¬ 
tle gourd. Twelve leaves and seven cotyledons were inoculated, 
ail of which, except two leaves, became infected. As these two 
leaves pressed against the bell-jar, dead areas appeared in them 
and soon the entire leaves turned brown and died. 
It is interesting to note that the incubation period was longer 
in the case of the bottle gourd than with the other cucurbits. 
For example, plants of the bottle gourd, mock orange gourd, 
and Talby’s Hybrid cucumber were inoculated with conidia 
from the Princess cucumber on April 26th. On May 6th there 
were several patches of mycelium producing conidia abundantly 
on the inoculated parts of the mock orange gourd and the cu¬ 
cumber, while there was no sign of infection on the bottle 
gourd. Four days later, however, patches of mycelium produc¬ 
ing conidia were present on the inoculated parts of the bottle 
gourd also. This longer incubation period was not observed in 
connection with the dipper gourd. 
RESULTS ON THE CUCUMBER, CUCUMIS SATIVUS LINN. (TABLE v). 
Seedlings of cucumbers were used in sixteen experiments, 
six different varieties being used, as shown in Table V. Four¬ 
teen leaves and forty-four cotyledons were inoculated. Thirteen 
of the leaves and thirty-six of the cotyledons became infected. 
The remaining cotyledons died before the mildew had time to 
