50 
Colorado Experiment Station 
ing on this source of supply. The end result is all that we can 
definitely establish and this shows the presence of 0.926 per cent 
of ash. The trees growing on the, river bottom, sandy loam soil, 
appear to be perfectly healthy. The growth is vigorous and the 
bark has a normal color. There are almost no signs of unhealth¬ 
iness in this orchard 'that I saw or to which my attention was 
called. The orchard had been sprayed but not as regularly and 
persistently as the preceding one. The living trees from the pre¬ 
ceding orchard are certainly more nearly comparable to these trees 
than the dead tree is because they are living trees and because the 
parts of the trees were of the same size and approximately of the 
same age. We, find that the limbs of the trees 
growing on marly soil contain 2.00 per cent of ash while 
th^>se growing on the sandy loam carry only 1.17 per cent. The 
average percentage of ash in the young trees grown at Geneva, 
N. Y., is 1.55 while the percentage in Colorado trees assumed to be 
normal is 1.17 per cent. The dead tree grown on marly soil con¬ 
tains a less percentage and the living tree a larger pencentage of 
ash than either the New York trees or the Colorado trees grown 
on a sandy loam soil. The New York trees were taken for ex¬ 
amination early in the spring before the buds were we,11 developed. 
They ought, therefore, to be comparable in this respect. 
We see that the living trees on the marly soil contain 1.7 times 
as much ash as the trees growing on the sandy loam and 1.3 times 
as much as the young trees grown in New York. I have separated 
the bark from the wood and the statements of my further results 
are not directly comparable. 
Wood of the dead tree, marly soil, 6464 grams, percentage of 
ash, 0.453, amount of ash obtained 29.28 grams. Bark from the 
wood of the dead tree, 624 grams, percentage of ash, 7.854, amount 
of ash obtained 49.00 grams. The percentage of ash in the bark is 
t 7-3 times as great as in the wood. The percentage of insoluble 
ash in the bark is 18.35 times and that of the soluble ash 11.6 times 
as great as in the wood. 
Wood of living trees, marly soil* 8760 grams, percentage of 
ash 0.539, bark 1516 grams, percentage of ash 10.452. Amount 
of ash obtained from wood, 47.22 grams, from bark 158.45 grams. The 
percentage of ash in the bark is 19.39 times that in the wood; that 
of the insoluble ash in the bark is 28.4 times and that of the soluble 
ash 6.5 times that of the wood. 
Wood of healthy trees, sandy loam, 6794 grams, percentage 
of ash 0.389, amount of ash obtained 26.34 grams, bark 878 grams, 
percentage of ash 7.21, amount of ash 63.30 grams. The percent¬ 
age of ash in the bark is 18.53 times that in the wood; that of the 
insoluble ash 24.93 times, and that of the soluble ash 6.18 times as 
great as that in the wood. 
A comparison between the quantities of ash in the living trees 
from the marly soil and in those growing in a sandy loam shows a 
decidedly higher percentage, both in the wood and bark in the former 
