WEATHER CONDITIONS.

A brief statement of some additional work by the Geographer, Dr. F. P.

Gulliver, follows:—

Since the last report very few definite facts have been obtained as to

the relation of rainfall to the spread of the blight, but nothing has

yet been learned which would contradict the opinion previously stated

that blight dissemination increases much more rapidly during rainy

periods.

Final report of the Pennsylvania Chestnut Tree Blight Commission · 第 83 / 145 题