32 
Proceedings of the American Association for the Advancement of Science. ¥7 vols. 
iver itton. 
panned a@ a Papers on cag Printed for the Ray Society. London, 1841, 
‘iven 
Science. 9 vO (Give ine Dr. Brit 
The American Entomologist and Pee, 
ene 
n. ) 
Vol. II., 1890. (Given by: Professoy 
of the Linnaean Society of New York, Vol. 1, 2, 1882-84. (Given 
Transactions 
oe Prot Britton. 
ird Annual sue ‘ the Commissioners of Fi:heries, Game and Forests of the 
a of New York, 
NOTES, NEWS, AND COMMENT. 
. Stewart, of the Geneva Experimental Station, has 
de an extensive study of the “leaf scorch,” affecting sugar 
beets, cherries and maples, which results in killing a portion of 
all of a leaf. He concludes that this injury is due to the rapid 
effect of hot dry days. A period of this eee occurred early 
in August in New York, and a second in the first week of Sep4 
tember. It happens whenever the quantity of water er rani 
by the leaves i is greater than that which the roots are able to s 
t about in sev- 
are: area of leaf surface exposed, quantity of water in the soil, 
activity of the roots, and location of the tree as regards exposure 
to wind. Having in mind these several factors it is easy to un- 
tree standing close beside it may not 
the periods mentioned many for als 
Several specimens of honey- ieee ‘(Clediclia tricanthos) and 
hickory (A/icorta ovata) in the Garden were affected. The dam- 
age is not serious, or permanent usually 
