580 Agricultural Experiment Station, Ithaca, N. Y. 



The soil was very lirmly compacted, and was light reddish yellow, 

 denoting the absence of vegetable matter. Plants were growing 

 profusely all about the spot, sending their roots close about the 

 poisoned area. Upon making a section of the soil various holes 

 were found, left by the decay of roots, and in these channels the 

 Paris green could be plainly seen at a depth of two or three inches. 

 Aside from this, there was no visible evidence of the Paris green in 

 the soil, but the entire original application still lay intact just under 

 the surface, having been slightly covered with soil by the rains of 

 summer. 



C. Sample taken October 7th, 3 in. down, and found to contain 

 the merest trace of arsenic, not enough to make a quantitative esti- 

 mate possible. 



D. Another sample at 3 in., which also showed the merest trace 

 of arsenic. 



E. Sample at 5 in. showed considerable arsenic, more than at 

 3 in. (C). On searching for the cause of this the sample was 

 found to have the remains of a rootlet about the size of a knitting 

 needle running down through it. It was evident that the arsenic 

 had passed down this channel. Consequently another sample was 

 taken : 



P. Five in. deep, in solid soil. No trace of arsenic under the 

 most searching test. 



G. Seven in. deep. No arsenic. 



Experiment II. 



On the 5th of June, 1895, 2 oz. of Paris green (from the same 

 stock as that used in Exp. I.), without lime, was placed on an area 

 as large as the two palms, on a low, black, moist soil which had been 

 deeply spaded the fall before. The soil was loosened up an inch 

 deep with the trowel and then lightly compressed with the hand ; 

 and on this surface the poison was placed, and then covered with a 

 half inch of earth. This land was moist all summer long, and when 

 the iirst examination was made, Oct. 5, the area had received eleven 

 and a half (11.39) inches of rain. As in the first experiment, plants 

 sprung up close about the spot and grew lustily. The examination 

 in October showed that the under soil tended to run together in 

 blocks, so that it was brittle and seamy ; and angle-worms had 

 worked in it. The basis of the soil was clay, which had become 

 dark-colored by the accumulation of humus. 



