- 10 - 
July show 525 cases in all classes of livestock in the trapped area and 
743 cases in the nontrapped area. The average animal population for 
the month was 122,112 in the trapped and 91,727 in the nontrapped area. 
If we express the number of cases in each of the two areas in percentage 
of animals infested it will be noted that the cases of myiasis in the 
trapped area were reduced approximately 47 per cent." 
Nicotine sulphate efficient blowfly larvicide.--In July E. W. 
Laake, Dallas, Tex., completed several tests on the toxicity and effects 
of nicotine sulphate and dipyricyl oil as larvicides in blowfly baits. 
He says: "The bait used consisted of 2 pounds of boneless beef to 1 
gallon of tap water, exposed in sterilized gray enameled bait pans under 
Standard size cone-type traps. The duration of each test was 20 days. 
All of the traps were rotated daily in order to equalize as nearly as 
possible the difference in locations of traps. During the 20-day ex- 
posure of the baits, a ~H test was made daily and the number of blowfly 
eggs deposited on the bait and the number of larvae, dead or alive, 
in the bait were estimated as closely as possible. *,* * In aliigpegene 
tests the traps were placed on a concrete dock along the fertilizer 
department of a Dallas packing plant, where flies are always abundant, 
and it is certain that prevailing conditions are admirably adapted for a 
fair test in every respect. * * * Conclusions are very definite that 3 
cc of nicotine sulphate per gallon of water is sufficient to secure a 
control for the larvae and to obtain the greatest efficiency for volume 
of flies caught." 
Wound disinfection by blowfly maggots .-—-William Robinson, Waching— 
ton D. C., in cooperation with Doctor Norwocd, has for several months 
been making a study of the use of mageots in the treatment of osteomye= 
iitis. He reports: "The work was done chiefly in Baltimore, Md., in the 
Church Home and Infirmary. * * * Qur purpose was to find out how mag— 
gots bring about wound disinfection. Maggots were taken directly from 
wounds, and aseptic dissections under a microscope were made of the ali- 
mentary tract to determine the fate of the disease-causing organiems in 
their passage through the 'stomach' of maggots. Repeated cultures show— 
ed that maggots are able to destroy bacteria by digestion and that des— 
truction takes place mainly in the mid-stomach. The contents of the in- 
testine were invariably found to be sterile, although the fore-stomach 
was always heavily contaminated. Maggots were also found to hasten dis-— 
infection of the wound through their Scavengering effect py consuming 
large quantities of the necrotic tissue of the wound. They also cause 
the wound to secrete freely a serous liquid and as this flows from the 
wound it carries off large numbers of bacteria in the excess discharge." 
Colloidal Paris green as a mosquito larvicice.--G. H. Bradley and 
T. E. McNeel, Orlando, Fla., report that "Results of tests made with 
this material in the laboratory in clear rain water show that it wiles 
Kill larvae of Culex quinquefasciatus Say and Anopheles crucians Wied. 
in the laboratory at dilutions up to 1 part of Paris green to 1,000,000 
parts of wate>. Greater dilutions have given negligible killing. Prac-— 
