EXPERIMENTS ON ORANGE INSECTS. 27 
used on these trees. Weather hot and dry. From each tree samples 
for microscopic examination were taken. (See table.) 
After two days a mass of scates was taken from No. 2. In 140 only 
one was found with the eggs entire, all the others having collapsed. 
The appearance of the scales on this tree and on the others, that had 
not been washed with water, was quite different. On No. 2 many scales 
were quite black; none where the water struck them had their natural 
color; all appeared as if rotting, were very loosely adhering to the bark, 
and could easily be washed off. 
On No. 3, at first sight, the scales wore their usual appearance. A 
closer examination showed many scales loose, but adhering sufficiently 
to resist ordinary winds in dry weather. 
On No. 4 about the same as No. 3. On No. 5 many scales were tightly 
adherent. 
August 23.—On No. 2, where water was applied, many branches are 
almost free of scale. Examination with a lens showed no living insects. 
No sign of damage to the tree. 
No. 3. Seales are loose and many shedding. 
No. 4. Same. 
No. 5. Seales are more adherent than on the other trees—2, 3, and 4. 
A living larva is occasionally seen. From sample of scales taken from 
No. 5, under the microscope a mass of 164 was examined, of which four 
had living eggs. 
September 8.—No. 2 has shoots on the cleaned limbs. No. 3 shows 
sprouts on scaly branches; Nos. 4 and 5, no young sprouts. 
September 16.—On No. 2, shoots are 8 inches long. There are some on 
all the others; no sign of increase of insects. 
September 26.—The young on all but No. 5 are growing fast. There 
are some shoots on No. 5. 
October 25.—No. 2. No scales on the limbs of this tree. On one twig 
some few larve and some eggs living. The young shoots are 30 inches 
in length. The limbs that were covered with scales have made a vig- 
orous growth of young wood. 
No. 3. Some old scales are still adhering, no larve or eggs among 
them. On some twigs are a very few larve and living eggs. The tree 
looks healthy; has made good growth; from the limbs that were in- 
fested, shoots are from one to three feet in length. 
No. 4. Some old scales remain, no life among them. 
No. 5. A very small number of old scales remain; avery small number 
of living larve and a few eggs were found. The tree has suffered from 
rust mite. It has made a little new growth. 
TREES Nos. 8-20. 
September 12.—From a large number of young (four to five years old) 
trees in a grove, all infested with insects, M. gloverii principally, the 
following were chosen for experiment. All were badly infested; all had 
