y 
§54 New York AGRICULTURAL EXPERIMENT STATION. 
The inference from the above table is that the stocks which 
held their leaves through the season made a greater growth in 
diameter than those from which the foliage dropped in July 
and August. Taking the average of all stocks treated with 
ammoniacal solution, ninety-four in number, we have 25.7 thirty- 
seconds of an inch, while the average of eighty-one stocks treated 
with Bordeaux was 26.5 thirty-seconds. The better of these 
two averages (26.5) when compared with the untreated (20.6) gives 
an increase in diameter of 5.9 thirty-seconds or nearly three- 
sixteenths of an inch. 
Cuerry Lear-Buieutr (Cylindrosporium padi, Karsten). 
The leaf blight of cherries caused by the same species of fungus 
as that producing plum leaf-blight, is very widespread. Scearcely 
a wild species of the genus /runus is entirely exempt from the 
disease, and at all stages from seedlings in the seed bed to old 
bearing trees, cultivated cherries are subject to its attacks. ‘Lhe 
greatest variation exists, however, as regards the susceptibility 
of different varieties, some being nearly exempt and others, as 
the English Morello, materially damaged by it. Remarkable cases 
of immunity are sometimes observed. Of seedlings used for 
budding, only the Mazzard seems in any serious degree dam- 
aged by the disease. In unfavorable years the defoliation is 
so serious as to render the first year’s growth of stocks almost 
insignificant. Mazzard seedlings of the second year are also 
badly attacked. The greatest damage probably occurs where 
Mazzard stocks are budded with susceptible varieties, in which 
ease the cumulative effect of the disease appears. It is a fact 
to be noted here, however, that the cherry leaves attacked by 
the parasite remained attached to the stocks long enough to take 
vn the yellow autumn tints characteristic of foliage from which 
the valuable ingredients of potash and phosphoric acid have been 
removed.* It is probable, although no experiments have to my 
* According to the prevailing views of the physiological botanists, Pfeffer, Sachs, Detmer. 
Wiesner and others, the valuable mineral constituents of leaves are withdrawn from them at 
the same time as they become yellow and before they fall to the ground; but therecent paper 
of Wehmer, Die dem Laubfall voraufghende vermeintliche Blattentleerung. Ber. d. deutsch. - 
bot. Gesellsch. 10 Jahrg., Heft. 3, pp. 152-163, indicates that the grounds for this belief may not 
have been sufficiently proven, and the whole subject needs further investigation. 
