131 
This insect causes large blister-like spots on the leaves of different 
oaks, these spots, which sometimes cover a large portion of the 
leaf, turning brown and injuring and disfiguring the foliage of the 
entire tree. The blisters are caused by small larvae which work 
under the epidermis of the leaf and are thus protected against 
the ordinary treatment by spraying. The insect hibernates in 
the old leaves and one of the means of control which has been 
recommended is to gather these leaves and burn them, thus pre- 
venting further infection. 
In the Gardener’s Chronicle for 1911, G. Webb describes a 
successful treatment of hollyhocks against attacks of the rust 
(Puccinia malvacearum) by the application of a powder which 
consists of 1 bu. of slaked lime, 1 bu. of soot, 4 lbs. of flowers of 
sulphur, and 2 oz. of finely powdered sulphate of copper. This 
mixture should be passed through a fine sieve and the plants 
dusted with the powder three or four times during the growing 
season, in the morning while the dew is still upon them 
Metereology for July.—The total precipitation recorded for the 
month was 2.84 inches. Maximum temperatures were recorded 
of 92° on the 4th, 100° on the gth, 90° on the 12th, 88° on the 
18th, and 89° on the 28th. Also minimum temperatures were 
recorded of 48° on the Ist, 62° on the 15th, and 53° on the 20th 
and 25th 
ACCESSIONS. 
MUSEUMS AND HERBARIUM. 
3 specimens of Dicranum from Connecticut. (By exchange with Dr. George E. 
Nichols.) 
pripedi gi from Massachusetts. (Given by Mrs. N. L. 
n.) 
I — of Dicranella heteromalia from England. (By exchange with Mr. 
H.N. 
234 specimens of grasses from the western United States. (By exchange with 
the Bureau of Plant Industry, Washington, D. C.) 
53 specimens from Anguilla, West Indies. (By exchange with the Botanical 
Garden, Utrecht, Holla: fe 
3 specimens of lichens from Washington. (By exchange with Mr. A. S. Foster.) 
8 i f fi i 1 f I n United States. (By exchange 
with the United States National Museum.) 
