-~ 12 « 
eges have been placed in hibernation in the hope of continuing the stud-— 
ies next summer through aphids of known behavior." 
A. C. Davis, Takoma Park, Md., reports that "during the early part 
of the month (November), in conjunction with E, B. Lambert, experiments 
were continued to determine conditions in composting manure at Arling- 
ton Farm and at a mushroom plant at Capital Heights, Md. Mr. Lambert 
also made some observations in Pennsylvania. It was found that (the 
temperature of) the manure, except for a shell of about 6 inches on the 
top and sides, and from 2 or 3 inches to a foot or so on the ground, 
is in excess of 120° F., reaching 170° in some places. The areas of the 
different temperatures have been located as accurately as possible, and 
a contour map of the square, flat-—topped heap made. It is planned to 
experiment with and record data on this subject from heaps of different 
shapes. Oxygen was found to be nearly lacking, and C02 to reach a con—. 
centration of 28 per cent in the poorly heated central, ground level por- 
tion of the pile. Experiments carried out with mites and springtails 
* * * in the laboratory indicate that these can survive indefinitely in 
this atmosphere of COz where the normal amount of oxygen is present in 
the other 72 per cent of air." 
A summary of control operations against the pepper weevil (Anthono- 
mus eugenii Cano) at Alhambra, Calif., is submitted by R. E. Campbell: 
"Cryolite, potassium hexafluoaluminate, barium fluosilicate, and calcium 
arsenate were all found to be more or less effective against the pepper 
weevil when applied under controlled cage conditions where a known num— 
ber of weevils were introduced. Cryolite was the most effective mater— 
ial and the other materials were each in turn slightly less effective 
in the order named. The flourine compounds in general showed higher 
mortality than did calcium arsenate. Barium fluosilicate, though ef- 
fective as a weevil control, not only burned the leaves but caused stunt- 
ing and yellowing of the pepper plants. * * * Plants dusted with cryo- 
Lite exhibited some leaf injury and bud pruning but did not appear un-— 
usually yellow or retarded. * * * Even though the flourine compounds 
materially reduced the infestations they failed to increase production 
proportionately. In the case of barium fluosilicate the reduction both 
in infestation and yield is very striking. These plots also showed de— 
cided stunting, leaf burning, and bud pruning. In the other plots where 
cryolite, potassium hexafluoaluminate, or 40 per cent barium fluosilicate 
was used, the same symptoms were present but varied from very slight to 
rather noticeabie injury. The calcium arsenate plots continued to yield 
peppers long after there were none left on the other plots." 
Mr. Campbell submits additional data on the life history and habits 
of the wireworm Pheletes califurnicus Mann. He says: "On November 30, 
7 drain tiles, 6 inches in diameter and 24 inches deep, in each of 
which 50 medium-sized wireworms had been put on July 12, 1930, were ta— 
ken up and examined," and that larvae were found at depths of 8 to 21 
inches and adults at depths of 6 to 14 inches. 
