14 N. H. AGE. EXPERIMENT STATION. [Bulletin 183 



or the equivalent of 11 to 25 apples to equal a medicinal dose, 

 ■or 330 to 750 to equal a dangerous dose. 



Examining into the effects of rain and weather, as reducing 

 the amount of poisonous residues, we find the following: 



Where fruit was picked in the ordinary fashion, the average of 

 ^several lots picked within 3 to 5 days of spraying, and before a 

 Tain, showed .5 milligram per apple. Where 27 to 57 days had 

 elapsed the average was .24 milligram per apple. And where 

 75 to 91 days had elapsed, the average was .13 milligram per 

 apple. This is a reduction in arsenical residues for the whole 

 .period of approximately 75 per cent, due, apparently, to the effects 

 of rain and weather. 



Looking at it from another angle and considering the apparent 

 effect of handling the fruit with gloves, or wiping it, we find the 

 following: 



Where no rain had fallen and the fruit was picked within 3 

 to 5 days after spraying, the average picked in ordinary fashion 

 is .5 milligram per apple, that picked with cotton gloves is .21 

 milligram per apple and that picked with cotton gloves and wiped 

 in picking is .18 milligram per apple. This indicates a reduction 

 of half in the amount of residue as the result of use of the cotton 

 gloves. This it will be remembered is fruit that has not been 

 subject to rain. 



In the case of fruit that had remained 27 to 57 days on the 

 trees, and had been subject to rain, the average picked in ordi- 

 nary fashion is .24 milligram per apple and that picked with 

 gloves, .15 milligram. Here we have a reduction of approximately 

 40 per cent. 



Where the fruit was allowed to remain for 75 to 91 days on 

 the tree after spraying, the average of that picked in ordinary 

 fashion was .13 milligram per apple, that picked with gloves, .12 

 milligram per apple and that picked with gloves and wiped, .8 

 milligram per apple. Here it will be observed that the reduction, 

 due to the method of picking, is comparatively slight. 



The results obtained in the supplementary experiments in 

 1916, as summarized in Table No. 4, are for fruit picked in or- 

 dinary manner, two lots before a rain, and two lots immediately 

 after a sharp shower of 10 minutes' duration. They are intended 

 \to serve as a check on the previous experiments. It will be 



