Appendix. 161 



once on the tenth, in each case with fifteen gallons. Forty-two per cent 

 of the scales alive at the beginning of the experiment; eighty per cent 

 of these dead on the fourth day and ninety-two per cent on the tenth day; 

 the average final effect, the destruction of ninety-three per cent of the 

 scales. 



Tree No. 31. — An apple tree, twelve feet high, with an eight-inch trunk 

 and a nineteen-foot top; in good general condition, and moderately in- 

 fested by the scale. Once treated with thirty gallons of water, on the 

 next day after the application of the insecticide spray. Thirty-seven per 

 cent of the scales were alive in the beginning; seventy-eight per cent 

 of these were dead on the fourth day and eighty-three per cent on the 

 fifth; the final average effect of the insecticide, eighty-five per cent de- 

 stroyed. 



Tree No. 32.^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, begin- 

 ning the next day after the insecticide spray was applied. The second 

 of these treatments coincided with the first day's rain. Forty-four per 

 cent of living scales at the beginning: sixty-nine per cent of these dead 

 on the fourth day and eighty-six per cent on the tenth, according to the 

 sample for that day; the final average effect, the destruction of eighty- 

 five per cent. 



Tree No. 33. — A peach tree, nine feet high, with a three-inch trunk and 

 an eight-foot top; in good condition, moderately infested by the scale. 

 Sprayed twice in succession with fifteen gallons a day, following immedi- 

 ately 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; 

 seventy per cent of these dead on the fourth day, and eighty per cent on 

 the tenth; final average effect, the destruction of eighty-seven per cent 

 of the scales. 



Tree No. 35. — A peach tree fifteen feet high, with five-inch trunk and 

 a twelve-foot top; in poor condition, and moderately infested 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; sixty-two per cent of these dead on the second day and 

 ninety per cent on the fifth, with an average final destruction of ninety- 

 four per cent of the scales. 



Tree No. 36. — A peach tree, fifteen feet high, with a six-inch trunk 

 and an eight-foot top; in poor condition, and heavily infested. Treated 

 with water twice, once on the day following the insecticide treatment 

 and once on the tenth day of the experiment, the last treatment coin- 

 ciding with the third day of rain. Fifty-one per cent of the scales alive 

 in the beginning, and fifty-one per cent of these dead on the second day 

 after insecticide treatment; eighty-five per cent dead on the fifth day, 

 with a final average destruction of ninety-seven per cent of the scales. 



11 



