42 
> 
London purple. —Of twenty-two bugs placed on a potted grass 
plant, dusted, plant and all, with London purple and enclosed in 
a netting bag, eighteen were dead and four alive at the end of 
seventeen hours. 
September 10. In a similar experiment on twenty-four bugs, 
but six were found dead in sixteen hours. 
Paris green. —September 9. In a like experiment with chinch 
bugs confined with growing grass and dusted thoroughly with 
Paris green, but five were dead out of twenty at the end of forty 
hours. In another, only three were found dead out of nineteen. 
Check lots of bugs not poisoned, showed at this time such a 
susceptibility to confinement, owing probably to the existence of 
disease among them, that little value can be attached to these 
results. It is clear, at best, that only the arsenic can in any case 
be worth considering. 
Egyptian insecticide. —This substance, received from the manu¬ 
facturers,* was applied very freely to corn in the field, at Albion, 
Illinois, August 21, 1888, being sprinkled thoroughly on stalks 
and leaves, and behind the leaf sheaths. Nine and a half hours 
afterwards the bugs were feeding as before, apparently not sheeted; 
but a very heavy rain following, which washed the insecticide 
down behind the leaves, the bugs on this corn seemed to be 
diminished in number at the end of forty-eight hours. In seventy- 
two hours a few were found dead, but those living were as active 
as before. The corn rows treated were, however, clearly less 
abundantly infested after the rain than those adjacent. 
On the other hand, the dry powder applied very freely to six 
bugs confined with a grass plant had not taken visible effect in 
twenty-eight hours. 
Buhach. —In a single experiment with this powder applied dry 
in the usual manner, all the bugs died within twenty-five hours. 
Corrosive sublimate. —An aqueous solution made with two grains 
of corrosive sublimate to six ounces of water, had no effect on 
chinch bugs in two experiments, sixteen and twenty-four hours 
after thorough application. 
Steam. —At the St. Clair county fair, in Belleville, September 
11, 1888, Mr. George C. Bunsen, of that town, reported in the course 
of remarks on the chinch bug, the successful use of steam thrown 
against the stalks of corn from an apparatus of his invention. 
Experiments subsequently made at the office showed that with 
sufficient care steam may be used to kill chinch bugs without in¬ 
jury to ttie plants on which they are exposed; but as the differ¬ 
ence is slight between the time needed to kill or disable the 
insects and that sufficing to damage vegetable tissues (very slight 
if the vegetation is at all fresh), the care required will usually be 
such as to make the method impracticable in field operations. It 
•Egyptian Insecticide Co., 203 Pine Street, St. Louis. 
