STATE Museum oF NATURAL History. 35 
small portion of the exposed flesh being examined it was found that 
the spores had germinated and had commenced sending out their 
threads or mycelium. No change was observed where spores had been 
sown on the rind. 
On the 27th the discoloration about the sear had increased in extent, 
and the spot where the spores had been planted on the flesh was sur- 
rounded on all sides by a rot-discoloration one-fourth of an inch broad. 
Nothing has yet come of the spores planted on the rind, nor did they 
appear afterward to produce any effect. On the 28th both rot spots 
had increased in size, and the flesh wound where the spores were 
planted was covered With a fine crop of the Oidium. On the 30th the 
two rot spots had run together and the scar was also covered with the 
oidium. Oct. Ist, nearly the whole peach was discolored. Oct. 2d, 
the whole peach was discolored and the Oidium had broken out in one 
new spot. 
Sept. 27. A hard, sound peach was inoculated in two places by 
making slight incisions under the rind, inserting in them the spores 
of the Oidium and then pressing down the rind closely in its original 
place, to shut off as much as possible exposure to the external air. Spores 
were also planted on the uninjured rind and moistened with water. On 
the next day the places of inoculation were surrounded by diseolored rot 
spots. No change appeared where the spores were planted on the rind, 
nor did these spores afterward produce any effect. Sept. 30th. The 
two rot spots abont the places of inoculation have run together and 
now oceupy about one-half the peach. Oct. Ist. The rot has ex- 
tended and reached the stem-scar of the peach, and there a nice crop 
of the Oidium has made its appearance. No Oidium has appeared in 
the two places of inoculation. Oct. 2d. The rot has extended and 
the Oidium has broken out in a new place on the part of the peach 
opposite the stem-scar. 
Sept. 27. A hard, sound peach was cut into halves and the Oidjum 
spores were planted in a small spot in thecut flesh of one of the halves. 
On the 28th there was a discolored spot about the place where the 
spores were planted, but not clsewhcre. The 29th, being Sunday, no 
observation was taken. On the 30th about one-third of the cut’ sur- 
face was discolored, the discoloration being only on the side where the 
spores were planted. Also the Oidium has appeared. Oct. 1st. The 
discoloration has extended and more Oidium has developed. Oct. 2d. 
The discoloration has extended but little, probably from lack of moist- 
ure, as the peach is becoming dry. The unplanted side is still un- 
harmed, though considerably dried. 
From these three simple experiments the following deductions are 
made: First, the Oidium does produce a kind of rot in the peach ; 
Second, the spores do not affect the peach when planted on the unin- 
jured skin or rind ‘Third, when planted on the freshly-exposed flesh 
they germinate most readily und reproduce themselves in about three 
days. These results might possibly be somewhat modified if the ex- 
periments were made on other fruits, but essentially I believe they 
would only be confirmed. 
The names that have been applied to this fungus by mycologists at 
different times are numerous. Among them are Torula fructigena, 
