MOSQUITOES. "191 
into 302x32—9,664 mosquitoes. Total number of eggs, 
larve and pupe, 17,259. July 22d, 1896, by a similar pro- 
cess, 19,110 mosquitoes were counted. At the present time 
(Sept.) not so many eggs are deposited, but there are still 
immense numbers of immature insects in pools and ditches 
and other suitable breeding-places. 
It is assuredly not a good thing to breed mosquitoes 
near our houses. To prevent them from doing so all that is 

Fig. 155.—Mosquito, female. Greatly enlarged. Original. 
necessary is to shut them off from a supply of air and there 
is an exceedingly simple and cheap way of doing it most 
effectually. Many trials have shown that by pouring just 
one or two spoonfuls of kerosene-oil upon the water in rain- 
barrels, and by stirring the water so that the surface is 
equally covered with a film of oil, all eggs, larve, and pupz 
die by suffocation within five minutes. This is surely a sim- 
ple way of killing multitudes of such insects, and as the oil 
will evaporate very soon, the water is by no means spoiled. 
If done very early in the season, and repeated every four- 
