298 
wild plum (Prunus Americana) received from Kentucky im 
1882. These descriptions do not apply to the ascophorous. 
or perfect form of the fungus, which does not appear to. 
have yet been named. A full knowledge of the develop- 
ment will eventually necessitate throwing the fungus into- 
another genus. 
Upon the wild cherry it produces little injury. On the 
cultivated cherry the injury is more considerable, but not 
often serious, so far as observed. The apricot and peach 
are also slightly affected. On the latter the fungus rarely 
produces many septoria spores, but after growing awhile, 
the tissues of the leaf containing the parasite become dry, 
separate perfectly from the surrounding healthy tissue, 
and drop out, leaving a round hole as cleanly cut as if made 
artificially. The appearance in peaches and apricots is. 

Fig. 10.—Leaves of cultivated plum perforated by Septoria cerasina. Orig~ 
inal. 
known as the gun-shot injury in California, where it is so 
abundant as to be detrimental, but whether caused by Sep- 
toria cerasina, or not, isnot Known tothe writer. In plums. 
(Fig. 10) the gun-shot holes are sometimes numerous, and. 
sometimes quite absent. The causes which determine the 
fall or retention of the spots has not been made out. 
WEED STATISTICS. 
The observations on the number of weeds found upon 
one-twentieth of an acre during a growing season have 
been continued. The plat selected this year was some dis- 
tance from the one used last year, and both were originally 
part of the same abandoned pasture. This one had been 
ploughed in 1882, and had borne four crops, with an annual 
dressing of commercial fertilizer, and without stable man- 
ure. The land on all sides has had constantly clean culti- 
vation. , 
ee 
a 
