TT0 NEW YORK STATE MUSEUM 
infested in the spring of 1900 and abundantly so the following — 
autumn. This is certainly not a very bad showing for this oil. 
Crude petroleum, undiluted Titusville oil. The disastrous results 
obtained with this substance last year acted as a check to more 
extensive experiments this season. It was decided to test in a 
small way some of the crude petroleum received from Titusville 
Pa., because, according te certain published accounts, it would 
not harm the trees. A description of its physical properties is 
given on p. 762. Three trees were sprayed with this substance. 
Tree 20, a Bartlett pear, was very badly infested with 
the scale in 1900, and it was selected among others, for treat- 
ment that spring with undiluted kerosene. It was in a very 
bad state to begin with, and last October even the suckers from 
this tree appeared to be in an unhealthy condition. It was 
sprayed Ap. 11, 1901, with this crude petroleum. It developed 
no leaves the present season, and it was probably nearly dead 
before the petroleum was applied. Tree 116 was a Lombard 
plum which was very badly infested with the San José scale, 
but, as the infestation was comparatively recent, and as the tree 
had received no previous application of an insecticide, it was a 
very good subject to experiment on. The oil was sprayed on the 
tree rather liberally Ap. 11, and July 3 it was seen that several 
limbs were seriously injured and dying, and that some of the 
others gave indications of feebleness. Aug. 9, this tree was 
dead, the result, undoubtedly, of the application of the oil. Less 
oil would probably have been less injurious, but the fact remains 
that this so called safe oil is not necessarily so. The third tree 
was Crawford peach, which was very badly: infested with 
San José scale, and, like the precéding, it had not been treated 
with any insecticide. The scales were so abundant as literally 
to cover most of the trunk and the larger limbs, and in some 
places they appeared to be two or three deep. This tree devel- 
oped no leaves, and it was probably very seriously injured by 
the scale infestation. Its death can hardly be attributed to the 
application of the oil. : 
Food’s whale oil soap no. 8 and 104 petroleum. The Standard oil 
was used in these experiments. There were 12 trees treated 
