EXPERIMENTS UPON SCALE-INSECTS AFFECTING THE ORANGE. 
By Jos. Voyle. 
Gainesville, Fla., October 27, 1882. 
Sir : I herewith submit to you ray report of experiments on scale-in 
sects with solutions of murvite, made as nearly as practicable in accord 
ance with your instructions. 
Respectful^, 
JOSEPH VOYLE. 
Prof. C. V. Riley, 
Entomologist. 
In carrying on this work, difficulties of various, unexpected kinds 
presented themselves. The details of the various steps, successful or 
otherwise, taken in trying to overcome these, although consuming much 
time, I omit, being tedious and of little value in the presence of final 
success. 
Every good result obtained has been carefully verified and practically 
tested in the field. 
All items of importance noticed were recorded, even when not directly 
within the scope of scale insects. 
The experiments have been confined to small trees for exact experi- 
ments, but for general results have been extended to trees of all sizes 
and conditions. 
The first day's work under your directions showed the necessity of 
some better means of applying solutions. After a few days' delay, to 
make better arrangements for the purpose, tree after tree was sprayed, 
but the microscopic examination showed so small a percentage of eggs, 
that they were remanded to the general list, and attention given to 
general results on badly infested trees until large percentages oi' eggs 
should again be found. 
Every spraying device was given a practical trial in the field, so that 
by actual use its advantages or disadvantages might be fully proved. 
This also brought a large number of infested trees under experimental 
observation. 
The principal damage done here is by Mytilaspis gloverii* M. vitri- 
cola is usually preseut, but in a very small proportion. In the spring 
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