202 REPORT OF THE BOTANIST OF THR 
were five checks on.the same tree. On November 1 the five 
inoculated shoots were all gumming freely at the points of inoc- 
ulation and the wood was disclored, while on. the checks there 
was no exudation of gum and no discoloration of the wood. 
It has already been mentioned that the trunks and branches of 
apricots and peaches are often infested by a species of Cytospora 
which we suspect is parasitic upon them. To all appearances, 
the Cytospora found on apricots and peaches is the same as that 
found on plums; but the apple Cytospora mentioned on page 175 
is different. The above experiments indicate that the Oytospora 
of stone fruits may not be the harmless saprophyte which it has 
heretofore been considered. On the plum it probably aggravates 
the injury caused by sunscald. 
Hart Ingury.—In April, 1900, while making some observa- 
tions in a plum orchard near Geneva we found that the plum 
branches, both large and small, were quite thickly covered with 
circular spots which were about one-eighth inch in diameter, 
recdish brown and generally a trifle elevated above the surround- 
ing bark. They were not conspicuous and yet easily detected 
by one looking for them. On the surface, the bark was smooth 
and sound, but when cut into it was found to be brown and corky 
to a depth of 1-2 millimeters. 
At first we were puzzled to account for the spots, but upon 
further examination it was found that they occurred only upon 
the northwest side of the limbs and were intermingled with hail- 
stone wounds made in the summer of 1898. Underneath the 
hailstone wounds there was the same brown, corky tissue. Then 
it became clear that the spots had been caused by hailstones 
which bruised the bark without breaking it. 
Similar spots were found also on the bark of apple, cherry, 
peach, pear and quince; but, with the exception of cherry, the 
spots were not externally visible. They were revealed only when 
the bark was cut into. On the cherry and plum the majority 
of the spots were visible externally, but on both there were some 
other spots which could not be located until after the outer layer 
of bark was removed. 
