1881.] the Peach Tree affected with the “Yellows.” 973 
UNHEALTHY LEAVES, 
get SS ere tees AES ab Pee ered CE MeNe be bas ic 0 GO46 
Rormuntic matter 2 0, oo hae ee 57.08 
MR hER an ele pe acs bere eee ae 3.76 
100.00 
There is a small per cent. of volatile matter in the leaves that 
in the estimation would raise the per cent. of moisture slightly. 
It will be seen from the above results that the unhealthy 
leaves are much better fitted to become the host of a parasitic 
fungus than are the healthy ones. 
As to what causes this abnormal amount of moisture, I have 
already formed an opinion, but desire to confirm it by further 
experiment, the results of which I hope to include in a future 
Paper devoted entirely to this subject. 
5. Fruit—I found that the most satisfactory results were to be 
obtained from an examination of the fruit, and therefore spent the 
treater part of my time upon that portion of the tree. Mycelia 
in abundance were found just beneath the skin, extending into 
the fleshy parenchyma a short distance. This fungus—identical 
with that found in the other parts of the tree—was unicellular, 
branching, and much enlarged in places. In some places the 
filaments were apparently filled with small oil globules and bodies 
closely resembling spores. In only a single instance did I find a 
distinct fruiting filament. That I did not find more of the fruit 
I regret very much, for in order to know fully the characters of a_ 
fungus, its fruiting system must be carefully studied. 
The single specimen of the fruit I examined is shown on Fig. 
5. Tt was found beneath the skin of a prematurely ripened 
_ Peach, detached from the remaining filaments present with it, and 
yet evidently it belonged to-the same growth. 
Several peaches were examined, and in no case did I fail to 
find the same branching form. , | : 
The method of branching and the form of the filament (shown 
on Figs, 3 and 4), as wellas the oil globules which they contained, 
: ne Lone 
fal rf J ene reminds 
and the fruiting system of th goid g 1, 7 
one of Saprolegniez, to which division of fungi this form seems 
to belong. And as the final result of my investigation uptothe = 
_ Present time, I believe this parasitical vegetable form to be at 
__ least a part of, and probably the whole cause of this disease. 
oe Many modes of procedure have been’ gg : S dt or ta cure 
