398 
JOURNAL OF ECONOMIC ENTOMOLOGY 
[Vol. 11 
Table of Insecticides I 
Borax 
Hypochlorite 
of Lime 
Stone 
Lime 
Copper 
Sulphate 
Iron 
Sulphate 
Pyrethrum 
1/2 in. coating 
Larvae dead 
Film dead 
Larvae dead 
Film dead 
Larvae dead 
Film dead 
Larvae dead 
Film dead 
Larvae dead 
Film dead 
Larvae dead 
Film dead 
1/4 in. coating 
Larvae dead 
Larvae dead 
Larvae dead 
Larvae dead 
Larvae dead 
Larvae dead 
1/8 in. coating 
Larvae dead 
Film dead 
Larvae dead 
Film dead 
Larvae dead 
Larvae dead 
Larvae dead 
Larvaae dead 
Film dead 
1/16 in. coating 
Larvae dead 
Film dead 
Larvae dead 
Film dead 
Larvae dead 
Larvaae dead 
Larvae dead 
Larvae alive 
Film alive 
1/32 in. coating 
Larvae dead 
Film dead 
Larvae dead 
Film dead 
Larvae dead 
Film dead 
Larvae dead 
Film dead 
1/64 in. coating 
Larvae dead 
Film dead 
Larvae dead 
Film dead 
Larvae dead 
Film dead 
Larvae dead 
Film dead 
1/128 in. coating 
Larvae dead 
Film dead 
Larvae alive 
Film alive 
Larvae dead 
Film dead 
Larvae alive 
Film alive 
1/256 in. coating 
Larvae dead 
Film dead 
Larvae dead 
Film dead 
1/512 in. coating 
Larvae dead 
Film dead 
Larvae alive 
Film alive 
1/1024 in. coating 
Larvae dead 
Film alive 
Larvae alive 
Film alive 
Table of Insecticides II 
Carbon 
Bisulphide 
Black Leaf 40 
Diluted 1-50 
Black Leaf 40 
Diluted 1-500 
Saturated Solution 
of Hellebore 
1 oz. to sq. foot 
Larvae dead 
Film dead 
Larvae dead 
Film alive 
Larvae alive 
Film alive 
Larvae dead 
Film dead 
1/2 oz. to sq. foot 
Larvae dead 
Film dead 
Larvae dead 
Film alive 
Larvae alive 
Film alive 
Large Larvae dead 
Small Larvae alive 
Film active 
1/4 oz. to sq. foot 
Larvae dead 
Film injured but still alive 
Larvae dead 
Film alive 
Larvae alive 
Film alive 
In general the tables show that the minimum dosage for the fly is 
destructive to the film. Three materials, 40 per cent nicotine, carbon 
bisulphide and hypochlorite of lime gave some promise but the first 
two were eliminated by reason of their cost. Hypochlorite of lime 
having been indicated by these tests as a possible agent, and having 
been advocated by Messrs. Metcalf and Eddy on page 760, Volume 
III of the American Sewage Practice, the writer desired to give it a 
test on the bed. 
Twelve pounds of hypochlorite of lime were applied at the Plainfield 
plant through the dosing tanks on one day, and the second day there¬ 
after the dose was repeated. About 60 per cent of the larvae disap¬ 
peared. It seemed as if the first day’s dosage killed or removed a part 
of the film and that the third day’s dosage killed a large part of the 
larvae. The incomplete kill resulting from this first treatment led to 
