EXPERIMENTS IN MOUNTING THE AMPIIIPLEURA PELLUCIDA. 123 
the phosphorus mount, I have entirely discarded the ring process, 
and when properly prepared will keep for alltime. They can be 
roughly handled and, unless enormous pressure is brought to ici 
upon the cover-glass, it isalmost impossible to ture them, and 
what is most important, the moment the medium is cold the slide 
atime granular crystals become deposited on the slide. A few 
Both of these balsams I have discarded in preference to the liquid 
amber. It contains all the elements necessary for mounting of the 
other two; it y managed, and by using a — extra heat 
it becomes as hard as the Canada balsam preparation: 
I took a good deal of trouble with this liquid saber preparation, 
as what is obtainable in our drug stores is very dark ; y 
chloroform and again filtering “all the granulations are got rid of, 
and I think it is quite as good as what I got from Ghee in Dresden, 
whose preparations Van Heurck, of Belgium, so sail recom- 
mended. 
solution and monobromide of ‘aphthain ; both ete a ringing. 
Muller prefers the biniodide to t e monobromide ; he says on 
account of its smell, but ng sa tells me it is owing to its 
unstableness as a medium ; for mounting diatoms it is far before 
the consistenc area 
In my satnesiations I had to contend with several An 
preparations very damaging to the eyesight. There are several 
