- 10 = 
poses to continue these investigations in an experiment that will permit 
migration as far as 7 feet. 
W. E. Fleming and F. E. Baker, Moorestown, in a study of the 
change in toxicity of different stomach poisons to the larvae of the 
Japanese beetle, report: "The insecticidal value of the different arsen— 
ates and fluosilicates has been determined immediately after applica— 
tion and 6, 12, and 18 months after the chemicals were mixed with soil. 
The data show that the fluosilicates lose their value as soil insecti- 
cides within a year, but the arsenicals did not change appreciably in 
their insecticidal value during a period of 18 months. The basic lead 
arsenate, which was initially low in insecticidal value, did not in- 
crease in toxicity and the acid lead arsenate, which was initially of 
high toxic value, decreased only slightly in toxicity." 
Mr. Fleming conducted an experiment "with high voltage, 2,200 to 
3,800 volts, as a means of destroying larvae in potted plants. It was 
found that these treatments were ineffective, except where prolonged 
until the soil was heated to a high temperature." 
J. W. Lipp, Moorestown, reports that "the injection of emulsi- 
fied carbon disulphide into the soil of potted plants continues to give 
satisfactory results in the control of the larvae of the Japanese beetle 
in potted plants. In this work 700 potted plants containing 9,000 larvae 
have been treated. A concentration of 3 parts of emulsified carbon 
disulphide in 1,000 parts of water appears to be the minimum quantity 
effective against the larvae. The indications are that Azalea indica 
will not withstand the treatment but, in view of the reaction of roses 
and other azaleas, it is expected that the treatment might be applied 
to several varieties without causing serious damage to the plants." 
H. C. Hallock, Westbury, N. Y., reports the completion of "the com— 
pilation of the leaf-area of leaves taken from the spray experiments 
last summer and the chemical analysis to determine the amount of arse— 
nic per square millimeter. * * * These tests show that the quantity 
of lead arsenate per square millimeter of leaf area was approximately 
double when the epray was applied personally than when applied by one of 
my agsistants. The application of 3 pounds of lead arsenate (powder) to 
50 gallons of water gave approximately double the milligrams of lead 
arsenate per equare millimeter of leaf surface as compared with 4 pounds - 
of coated lead arsenate (paste)." 
Mr. Hallock says that "Field diggings on January 27 in which 303 
grubs (of the Asiatic beetle, Anomala orientalis Waterh.) were counted 
showed the grubs to be distributed at the following depths: One inch, 
none; 2 inches, 2 per cent; 3 inches, 5 per cent; 4 inches, 12 per cent; 
5 inches, 20 per cent; 6 inches, 26 per cent;‘7 inches, 25 per centyus 
inches, 6 per cent; 9 inches, 3 per cent; 10 inches 3 per cent." Simi-= 
lar diggings for the Asiatic garden beetle (Autoserica castanea Arrow) 
"show a Slight grub movement but not as noticeable as in the case of 
Anomala orientalis. * * * the 205 grubs counted were found distributed 
