128 NEW YORK STATE MUSEUM 
most instances the living bark of the trees ranged from slightly 
green to a perfectly healthy green, and it was then expected 
that a goodly proportion would develop a fair amount of foliage. 
All the scale insects appeared to be killed. One peachtree in 
an adjoining orchard, which had been sprayed at the same time 
and under similar conditions with the 20% mechanical emulsion, 
was examined in March, and it was found that the fruit buds 
had apparently escaped all injury. 
An inspection of the same trees May 6 showed that a number 
had died, though this is not surprising after allowing for the in- 
juries by the scale insects and also for the damage done by the 
round-headed borer, which was exceedingly abundant in the 
orchard. The trees sprayed with the crude petroleum emulsion 
showed little or no more injury than those beside them treated 
with whale oil soap, and we are therefore inclined to believe that 
the petroleum inflicted relatively little injury. 
This mechanical emulsion, as previously stated, was applied 
under the same conditions to other trees, and the observations 
made on them are of considerable interest. “May 6 these other 
sprayed trees were examined with the following results. A 
Dutchess pear showed a few dead limbs, was not badly infested 
and bade fair to produce some blossoms. Another of the same 
kind was leafing out nicely and gave evidence of producing a 
number of blossoms. A Globe peachtree presented a very fair 
bloom,, though some limbs were dead at the tips. The latter we 
are inclined to believe was due to the weather of last winter, 
because similar injury was observed on a number of untreated 
trees. Meeches prolific quinces, of which several bushes were 
treated, were in excellent condition and had an abundance of 
flowers. Several Bartlett peartrees possessed a very good 
foliage and an excellent bloom. 
These and some other trees treated with crude petroleum 
emulsion the preceding December were also observed June 12 
with the following results. A Lombard plumtree was found 
to be nearly uninjured by the oil, while several Clapp’s favorite 
peartrees were hurt to some extent, the bark cracking in places 
in the case of one tree and none bearing any fruit. Some injury 
and no fruit was true of a Bartlett peartree, while another bore 
considerable fruit and two others some. A Botan plumtree had 
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