Arsenical Poisoning oe Fruit Trees. 27 
Seventh: These arsenical compounds have accumulated in 
the soil. 
Eighth: The accumulation of arsenic in the soil in an in¬ 
soluble form has already passed far beyond the limit of danger for 
arsenic in a soluble form. 
Ninth: The insoluble arsenical compounds are being converted 
into soluble ones in the soil. 
Tenth: The alkalies are the agents effecting the solution of 
the arsenic. > By alkalies, I mean, sodic carbonate, sodic sulfate 
and sodic chloride. 
Eleventh: The lime salts, viz. the sulfate, gypsum, and the 
carbonate do not effectively protect the arsenical compounds from 
the solvent action of the alkalies. 
Twelfth: Systemic poisoning may take place, probably does, 
by absorption of the arsenic with the nutritive solutions taken up 
by the feeding roots but the greater portion of the trouble appears to 
be from local irritant poisoning. 
Thirteenth: The arsenical poisoning is, in all probability, in 
many cases, complicated by lime poisoning. 
Fourteenth: The arsenic in the arsenite of lime is more read¬ 
ily brought into solution than that of the lead arsenate. 
Fifteenth: It is probable that the lime or marl in the soil and 
subsoil is also an agent acting conjointly with the arsenic in pro¬ 
ducing some of the trouble. 
