122 PREPARATION AND MOUNTING 
These scales are much more abundant than was formerly 
supposed, and new specimens are discovered daily; so that 
the student should always be on the look-out for them in 
his researches in the vegetable world. 
Most classes of objects, and the treatment they require 
when mounting them in balsam, have now been considered. 
The next chapter will be devoted to preservative liquids, 
and the best method of using them. - 
