1895.] Section G, A. A. A. S. 409 
find good conditions for rapid development and spread. The 
germ apparently finds access to the tissues by longitudinal 
checking. The disease has not proved serious except in wet 
weather or on plants copiously sprinkled. It seems to bea 
different disease from that described by Garman. 
SMITH, ERWIN F.: The southern tomato blight.—The more 
important points brought out by this paper were the non- 
identity of the disease with the cucumber wilt, and its iden- 
tity with the potato wilt, the susceptibility of various other 
solanaceous plants, including the egg-plant, and the estab- 
lishment of the cause of the disease. It was found that a 
bacillus, not yet fully studied, will set up the disease by in- 
oculation, which after a time is followed by other organisms 
that produce the stinking wet-rot. The primary infection of 
the host takes place, as a rule, through the parts above ground. 
GALLOwAY, B. T.: Observations on the development of Un- . 
cinula spiralis.—The development of the mycelium, conidia 
and perithecia, was described, bringing out many new de- 
tails. The germination of the ascospores was described. 
It was found that material kept in thin muslin sacks staked to 
the ground was in good condition for study throughout the 
winter. The ascospores could not, however, be made to ger- 
minate until spring. ‘A curious growth of mycelium from the 
resting perithecial cells was observed, which appeared to be 
a possible method of continuing the life of the fungus. The 
paper will be given in full in a later number of this journal. 
TRUE, RODNEY H.: The effect of sudden changes of turgor 
and of temperature on growth.—Radicles of Vicia Faba were 
used for the experiments. The variations in turgor were se- 
cured with solutions of nitrate of potassium. It was ascer- 
tained that a period of retardation of growth followed a 
change in the concentration or in the temperature, whether 
the change were in an increasing or decreasing direction. 
The reaction is that of a shock to the irritable organism. 
FRIDAY AFTERNOON, AUGUST 30TH. 
