No. 4.] FRUIT GROWING. 173 



wanted to see what conditions of atmosphere would favor or 

 retard the operation of the poison. I showered three of 

 those trees by holding the watering-pot off and showering 

 them, and the mixture was poured down at the roots of 

 three other trees. There was no difference in the effect 

 between the three trees showered on top and the three 

 watered at the bottom ; the difference was between the two 

 houses. The foliage of the trees in the house where we 

 had the hot, dense, muggy atmosphere, burned very much 

 more than the foliage of the trees in the house that was kept 

 cool and dry. I suppose that explains the reason why the 

 entomologists in the West gave us in the early part of their 

 work directions to use such a large proportion of Paris 

 green in water as here in the East would burn the foliage 

 very badly. I suppose it may be accounted for in that way. 

 Here we have a more moist climate, there they have a dry 

 climate ; so that they can put on a larger proportion of 

 Paris green than we can here, and not injure the foliage. I 

 could not understand it before ; I thought they had made a 

 mistake, and I was going over the whole ground to see 

 where the error was, because we want to have everything 

 exact, so that we can know every step and be sure of the 

 results. 



There was an allusion in the lecture to kerosene emulsion, 

 and I have tried a little of that. Indeed, I have tried a good 

 deal of it, first and last. I put a dozen pots of roses in the 

 greenhouse, and then I got some plant lice and put on them. 

 Those of you who know anything about roses and plant lice 

 know the lice will multiply with wonderful rapidity ; 

 and presently I had those roses literally covered with plant 

 lice, — every stem and branch and leaf was covered with 

 them, and the under side of every leaf was covered with red 

 spiders. When I got the full growth of those insects, I 

 made a pailful of kerosene emulsion, brought that into the 

 greenhouse, put the roses into it, shook them there, and 

 held them long enough to wet every part of the top. It took 

 me from three to four minutes to do it with each pot. In 

 two days' time there was not an insect on them. There was 

 not a red spider nor a plant louse, nor was there any after- 

 wards through the season. It was a perfect success. It did 



