126 EXPERIMENTS IN MOUNTING THE AMPHIPLEURA PELLUCIDA, 
the monobromide. Three different makers’ preparation all served 
in the same way until I used the salicylate of chinoline; now 
my preparations are permanent. 
Biniodide of mercury, solid.—This consists of a saturated solu- 
tion of the biniodide in piperine. e piperine is melted in a 
porcelain capsule; the biniodide is gradually added until the 
piperine will not ore, which is known by the red 
with spirit and attach the label. The whole process 
need not occupy five minutes until the slide is ready to use or put 
away in the cabinet complete. 
The alkaloids and crystalline preparation.—Here we enter upon 
a field of research the preparations of which are easily managed. 
As a mounting material the merest tyro in microscopical manipula- 
tion may make as perfect a mount as one who has devoted years to 
the my ey, of cements and ringing ; in fact, the majority of them 
ringing unless the fanciful iisarasopat chooses to finish 
off with a ‘pare or tricolour ring. If required, a ring of common 
glue and finish off with shellac, is all that is ae to prevent 
oil or moisture from getting under the cover-gla, 
Piperine.—First and most — is the sitet the alkaloid of 
the common black or white pe Tt can be used by itself, or as 
a base to prevent ivestedlinibions| in athe media which are intensely 
erystalline. Take for instance gy 7 acid, easily melted, but on 
the piperine on the slide, addtig a few crystals of picric acid, 
mixing it well together, a mediuin 3 is the result which I look upon 
as the best of the alkaloi 
oein is another subinistory preparation ; by treating it in the 
same way a medium of high refractive index is acquire 
The alkaloids of opium, with few exceptions, are all high class 
media. 
Papaverine and the muriate, codeine, cryptopine, narceine, nar- 
cotine, meconidine, meconoiosine, nitrate of furfurine, oscopi ne, 
hebaine are all good media. ‘Atropine, strychnine, aconitine, 
veratrine, jalapine, picrotoxine, quinine, cinchonine, cinchonidine, 
tharidin, hereon of quinine, santonin, salicylic acid, 
chrysophanic acid, pyrogallic acid, — salicylate of chinoline, 
“a ro em 9 lero The whole of these alkaloids oi 
ai yrs ce = 
ren bel eA 
