32 



370 from under its check. 23 per cent, of the former now showed 

 injury by the codling moth and GS per cent, of the latter. Next, 

 July 31, the trees having been sprayed the previous day, 53 apples 

 were collected under the poisoned tree and 120 under its mate, 14 

 per cent, of the former being wormy and 70 per cent, of the latter. 

 Again, August 7, lots of 93 and 61 apples, respectively, were col- 

 lected from beneath these two trees. 21 per cent, of those from the 

 tree sprayed with Paris green were found invaded by the pest — as 

 against 56 per cent, of those from the tree not treated. August 27, 

 34 per cent, of the poisoned apples fallen were infested and 70 per 

 cent, of those not poisoned. September 3, the ratios were respect- 

 ively 47 and 79 per cent. 



The number of fallen apples examined during the season amounted 

 to 665 from the poisoned tree and 1,037 from the other. Of the 

 former 22.7 per cent, were injured by the codling moth; of the lat- 

 ter 65 per cent., the injuries to the fallen apples from the experi- 

 mental tree being thus a trifle over one third of those from the 

 check. On the 10th September the apples were finally picked from 

 both these trees, — 846 from the first and 783 from the last. 



It will be noted, in passing, that a much greater percentage of 

 apples had fallen from the tree not treated than from its mate, the 

 ratios of fallen apples to the entire number upon the trees in the 

 beginning being 44 per cent, in the first case and 57 per cent, in 

 the second. 



Of these ripened apples 178 were damaged by the codling moth 

 on the experimental tree and 591 on its companion, the ratio for 

 the poisoned tree being 21 per cent, and for the other 75 per cent. ; 

 or, roughly, one fifth of the ripened apples on the tree sprayed with 

 Paris green had been damaged by the codling moth and three 

 fourths of those on the other. Finally, if we take fallen and ripened 

 apples together, 1,511 from the poisoned tree and 1,820 from its 

 check, we find that the codling moth had damaged 22 per cent, of 

 the former and 70 per cent, of the latter,— something over three 

 times as great a ratio for the tree not treated as for that which had 

 been sprayed. Or, more briefly, two thirds of the apples which 

 would otherwise have been damaged by the codling moth, were 

 saved by the Paris green. 



Turning now for a moment to the second tree, similarly treated, 

 I notice that the ratios for the total product of this tree differ so 

 little from those just given, that it is not worth while to detail them 

 here ; the ratios, for example, of both picked and fallen apples from 

 the two treated trees being respectively 22 and 20, and for the two 

 checks, 69 and 65. Finally, lumping the results from these four trees, 

 the two poisoned with Paris green and their two checks, the first 

 represented by 2,418 apples and the second by 2,^64, we find that 

 the codling moth had left its mark upon 21 per cent, of the former 

 and upon 68 per cent, of the latter ; that is, more than three times 

 as many apples were damaged on the trees not treated as upon those 

 which had been sprayed. In a word, crowding the remedy to the 

 utmost, we saved under exceptionally unfavorable circumstances, 

 two thirds of the predestined victims of the apple worm. 



