346 Canadian Record of Science. 
periment, that this element was exhausted from the soil and 
that potash might also be supplied in insufficient quantity. 
A number of trees were therefore carefully pruned to re- 
move as much as possible of the diseased structure, and 
muriate or chloride of potassium was supplied to the trees 
as a special food, together with other elements to make a 
complete fertilizer. It was now found that thenew growth 
was of a totally different character, and, so far as could be 
determined from mere external inspection, perfectly 
healthy. But more than this, the fruit, instead of being 
utterly worthless, as before, now became of high quality, 
and the life of the tree was so far prolonged that, instead of 
dying at the end of nine years, as was usually the case, the 
identical trees thus restored to health are bearing first 
quality fruit to this day, or twenty years after their period 
of first treatment. 
But this result alone, important as it is, does not fully 
answer the question from a scientific point of view, and we 
ure therefore called upon to see what changes, if any, were 
effected in the chemical constitution of the ash, and 
also in the cellular structure and distribution of the digested 
products. With reference to the first, the results are most 
significant, and tend to indicate that the supply of potash 
bears a direct relation to the normal condition. Thus 
Goessmann found the ashes to be constituted as follows: 
Fruit. Woon. 
: : Restored 
Diseased. Healthy. Diseased. ( ee 
Fe,O, 0.46 0.58 1.45 0.52 
CaO Bere ae 4.68 2.64 64.23 54.52 
WIEO}, Good casdoce 5.49 6.29 10.28 7-58 
KOascog 960060 00 18.07 16.02 8.37 11.37 
IE@oode0 vs90006 71.30 74.46 15.67 26.01 
From this it also appears that, with a deficiency of potash, 
lime increases, but does not replace it in functional value. 
Referring now to the internal structure, we also find 
most important changes accomplished. In the diseased 
