55. 
lodged, and ‘‘to make assurance doubly sure,” it is stamped into the 
earth. On most of the insect foes of the plant lice the dust produced 
no disastrous effect, but the larvae of Syrphidie would, in some cases, not 
recover from the pungent coating. 
Arsenites of ammonia.—This new preparation, for which F. J. Andres, 
25 Pearl street, New York, is the agent, was sent to me for experiment, 
in accordance with directions from the entomologist of the Department 
of Agriculture. It did not reach me until about the 1st of June, too 
late for use on a number of insects. It is a clear solution of arsenic in 
aqua ammonia, and apparently does not differ much from a preparation 
of my own devising, as reported on two years ago, and with the effects 
of which on vegetation I was not entirely satisfied. The directions ac- 
companying each of the gallon bottles, in which it is put up, are to use 
one tablespoonful of the liquid to a gallon of water. 
June7.—Weather clear and hot. Prepared a quantity of the fluid as di- 
rected and had it applied to the following plants: To potatoes, on which 
were a few Doryphora larve; to rose bushes, on which still lingered a 
few larvie of Selandria rose, Characlea angulata, and Amphipyra pyramt- 
doides; to cabbage, covered with full-grown and young larve of Pieris 
rape; to cucumbers and squash infested with Diabrotica. It was too 
late in the season to test it thoroughly on apple for the Codling Moth, 
and as there were scarcely any peaches or plums or curculios, its effect 
on the latter insect can not be reported upon. Portions of the trees as 
well as of cherry were sprayed to discover its effect upon the foliage. 
June 9.—Made the rounds of all plants sprayed and noted results as 
follows: 
Potato plants slightly scorched, edges of the leaves curled, larvee of 
Doryphora mostly on the ground dead, beetles sickly. 
Rose bushes uninjured, or very slightly burned where the leaves were 
very tender; all larve killed. 
Cabbage uninjured; all Pieris and other larve killed. Cucumbers 
much injured, squash less so; striped beetles killed or vanished. 
Peach and cherry foliage badly scorched, turned yellow. Plum and 
apple only slightly injured. Other experiments later in the season 
made with one tablespoonful of the poison to one and one-half gallons 
of water were not injurious to any except the most delicate foliage, 
while in most cases it sufficed to kill Sphinx quinquemaculata and Helio-° 
this armigera on tomato, Darapsa myron, Cidaria diversilineata, Psycho- 
morpha epimenis, and De.mia maculalis on grape, with but slight damage 
to the foliage. The fruit being “bagged” was not touched by it. 
Empretia stimulea on plum and pear and Datana ministra on oak also 
speedily died from eating leaves that had been dampened with it. 
I do not consider these experiments conclusive, as with the heat and 
drought, vegetation was not by any means in a vigorous condition, and 
therefore more liable to injury from poisonous applications. It isa 
most convenient preparation and leaves no sediment to disfigure the 
