54 INSECTS INJURIOUS IN 1902. 
places which were observed to contain larvae, on August 13th. 
This experiment was only partially successful. That is, immunity 
for a time was reported, but inability to be personally on the 
ground and make application more frequently, allowed the pest 
to emerge in large numbers during mid summer. An insurmount- 
able difficulty, however, which presented itself was the presence in 
the neighborhood of vast marshy tracts where it was impossible 
for a man to walk, much less a horse hauling a heavy spraying 
outfit. Until such places are drained and filled residents in such’ 
localities must expect more or less trouble. Yet much might be 
done in the immediate vicinity of the house. Five gallons of 
kerosene and a little watchfulness will do wonders. Mosquito 
larvae and pupae were observed in the vicinity of St. Anthony 
Park in pasture pools as late as October 30, at which time imagos 
were plentiful, and larvae, or ““wigglers,’ were found November 6. 
Unidentified wigglers were collected August 11th, and kept 
under natural conditions in breeding jars, with water from the 
pond where they were captured, until September 5th, at which 
date all were dead. During that period from August 11th to | 
September 5th, over three weeks, none emerged. . 
As to repellant applications for face and hands. Prof. Jno. 
D. Smith, of New Jersey, who has done and is doing much work 
in the line of mosquito experimentation, advises the use of Oil” 
of Citronella, which he says absolutely keeps off all kinds of 
mosquitoes. All who have used it at his request, writes Dr. Smith, 
are loud in its praise. Caution must be used to avoid getting it 
in one’s eyes. The writer has tried some laboratory experiments 
with Phinotas oil, simply to corroborate the published statement 
that one part of oil to 10,000 parts of water will kill mosquito 
larvae and pupae. This oil, made and sold by the Phinotas Chem- 
ical Company, is a secret compound which is undoubtedly supe- 
rior to kerosene, and also more expensive, it being quoted at 40 
cents per gallon. It was found that one part of the oil to 
12,000 parts of water killed larvae and pupae. Phinotas oil sinks 
to the bottom in globules, which almost immediately rise, spread- 
ing out in a film on the surface, and forming as they rise a fine, 
white “precipitate,” which permeates the water, killing all small 
organisms it comes in contact with: The accompanying  photo- 
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BIE or ania 
