so 



Tree XiK J/. — An apple-tree, twelve feet hig'li, with an eig-bt- 

 inch trunk and a nineteen-foot top; in g-ood general condition, and 

 moderately infested by the scale. Once treated with thirty gallons 

 of water, on the next day after the application of the insectide 

 spray. Thirt3^-seven per cent, of the scales were alive in the be- 

 ginning ; 78 per cent, of these were dead on the fourth day and 83 

 per cent, on the fifth; the final effect of the insecticide *)7..^ per cent, 

 destroyed. August 20, two hundred scales examined, all dead. 



Vree Xo ^2. -A peach-tree, twelve feet high, with a six-inch 

 trunk and a nine-foot top ; in fair general condition, but heavily 

 infested. Treated with fifteen gallons of water a day for three 

 days in succession, beginning" the next day after the insecticide 

 spray was applied. The second of these treatments coincided with 

 the first day's rain. l*\irtY-four per cent, of living scales at the be- 

 gfinning ; (>*) per cent, of these dead on the fourth day, and 87 per 

 cent, on the twentieth, according to the sample for that day. 



Vree Xo. ,;,'. — A peach-tree, nine feet high, with a three-inch 

 trunk and an eight-foot top ; in g-ood condition, moderately in- 

 fested by the scale. Sprayed twice in succession with fifteen gal- 

 lons a day, following immediately^ upon the insecticide treatment, 

 the second application coinciding- with the first day's rain. Forty- 

 five per cent, of the scales alive at the start; 70 per cent, of these 

 dead on the fourth day, 80 per cent, on the tenth, and 90 per cent, 

 on the twentieth. 



/)re Xo. ,\-,-. — A peach -tree, fifteen feet high, with a five-inch 

 trunk and a twelve-foot top; in poor condition, and moderately in- 

 fested by the scale. Treated but once with water, and that on the 

 tenth day after the experiment began, this treatment coinciding- 

 with the third day's rain. Thirty-eight per cent, of the scales 

 alive at the time of the application of the insecticide; (>2 per cent, 

 of these dead on the second day, *H) per cent, on the fifth, and 97 

 per cent, on the twentieth. 



'/ree Xo. ^6. —A peach-tree, fifteen feet high, with a six-inch 

 trunk and an eight-foot top; in poor condition, and heavily in- 

 fested. Treated with water twice, once on the da^' following the 

 insecticide treatment and once on the tenth day of the experiment, 

 the last treatment coinciding with the third day of rain. Fifty- 

 one per cent, of the scales alive in the beginning, and 51 percent, 

 of these dead on the second day after insecticide treatment; 85 per 

 cent, dead on the fifth day, with a final destruction of 100 per 

 cent, of the scales, according to the sample examined after twenty 

 days. August 20, two hundred scales examined, all dead, 



