6 
INSECTS AND INSECTICIDES. 
PYRETHRUM. 
This insecticide is procured from the powdered flowers 
of two species of pyrethrum. Its ability to destroy insect 
life resides in a volatile oil, which acts on the nervous 
system of the insect, and which is readily lost on expos¬ 
ure to the atmosphere—hence the difficulty often 
experienced in procuring it sufficiently fresh and of the 
desired strength. It is inocuous to man and the higher 
animals, and kills insect life only by contact. We have 
had success with this remedy under glass structures, and 
when it could be procured fresh have had success with 
it against smooth-bodied caterpillars out doors. We have 
not used it this season because of the difficulty in obtain¬ 
ing a fresh article. In using, it should be diluted one.to 
three parts of finely slaked lime or flour, and applied with 
a bellows. This should be kept in a closed vessel for a 
day at least, to assure the best result. One pound of the 
powder properly diluted will treat an acre of cabbage, 
and if fresh will be effective against the insects men¬ 
tioned. 
ongarth’s tree protector. 
This is a California remedy, tried here this season for 
the first time with success. It proved to be very effective 
against the squash bug, cabbage caterpillars and false 
chinch bug, or wffierever the kerosene emulsion would 
be effective. Its cost, however, would not permit of its 
profitable application on ordinary crops as against the 
kerosene emulsion, which is nearlv as effective and much 
cheaper. 
KEROSENE. 
This is one of the most efficient remedies against all 
insect life not affected by the arsenical poisons, caus¬ 
ing death by suffocation or by its corrosive action, and 
its cheapness places it within easy reach. To be applied 
successfully, however, it must be diluted with water, sev¬ 
eral formulae for which have been devised by various 
