200 American Horticultural Society. 



part of the kerosene to one part of lukewarm resin compound. Thus I ob- 

 tained two gallons of emulsion in less than three minutes that did not show 

 any trace of separation before the end of twenty-four hours. The result 

 would have been not quite so good if the resin compound had been used liot 

 in emulsifying, and still less so if two parts of kerosene had been used to one 

 of resin compound; but still this last will make a very good emulsion if 

 prepared properly, which is easily done. It has the good quality of si>read- 

 ing instantly over the leaves, if sprayed with dilutent, as well as do soap 

 washes. None of the experiments made during dry weather with this emul- 

 sion alone, i. c, without the additional arsenic acid, were appreciably etl'ect- 

 ive. The evaporation was very rapid, and in ten minutes after the applica- 

 tion no trace of the wash could be seen. 



In addition, I include results of various experiments with resin com- 

 pound, especially upon Aphidx, which it aflfects admirably; and, at the same 

 time, a wash can be prepared which will destroy all aphids and not injure 

 the larvae of syrphus flies, nor prevent the parasites from hatching from the 

 mfested aphids. 



Experiment 178 — Kerosene emulsion 167, with arsenic acid, of which 

 one pound in 55 gallons wash. Emulsion one part ; water fifteen part*. Ap- 

 plied August 30 on A. rapax on pear. September 1, leaves spotted, turning 

 brown. September 7, all leaves dead and dry ; bark not injured, except on 

 few smallest twigs; scales all killed. October 7, tree bringing forth new 

 shoots all over; some in blossom; all buds not dead growing. November 

 22, new shoots of eight inches in length had formed ; fruit did not set ; tree 

 in good condition, still growing. December 17, tree fresh and green ; no 

 scales whatever. 



Experiment 179— Kerosene 167, with arsenic acid, of which one ])ound 

 to 52i gallons wash. Emulsion one part ; water twenty parts. Applied Au- 

 gust 30 on AspidiUus sp. on currant, and A. rapax on cherr^'. September 7, 

 leaves nearly dry and falling off; scales appear to be dead, but still have their 

 natural color. October 7, all scales and eggs dead ; young shoots forming on 

 currant. November 22, currant plant still growing; some blossoms and 

 young fruit; ditto scales. December 17, no scales; a few of the berries have 

 become mature, but are small. 



Experiment ISO— Kerosene emulsion, with arsenic acid, of which one 

 pound to 55 gallons wash. Emulsion one part; water two jiarts. Applied 

 August 30 on Aspididus sp. on currant, A. rapax and M. pumorum on apple. 

 September 7, scales on currant where in thick layers not all dead ; a few eggs 

 and newly hatched young found; A. rapax on apple not all dead; gravid 

 females and eggs of M. p/nwrum not allected ; leaves of apple dry, and those 

 on currant nearly so. October 7, scales on currant all dry; plant growing; 

 A. rapax on apple all dead ; eggs of 31. porrmrum in good condition. Novem- 

 ber 22, no living scales on currant, this still growing ; eggs of M. pjmorum 

 still intact. 



Experiment ISl — Kerosene emulsion 165, with arsenic acid, of which 



