Notes on experiments in mounting the Amphipleura 
pellucida in media having a higher refractive 
index than Canada balsam. 
By Witu1am Morris, Fel. Fac. Phys. and Surg. Glas., F.R.M.S. 
Lond. 
[Read before the Royal Society of N.S.W., 4 November, 1885.] 
I wisn to ask your attention to-night in order that I may give 
my experience with mounting diatoms in some highly 
g. 
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Asa preliminary, I may mention to you that all my experiments 
have been made on the English test diatom Amphipleura pellucida, 
a very rare diatom, so much so that when in ngland in arte on 
applying to several opticians and diatom mounters 
quantity I found it a scarce commodity—it was not obtainable i 
love or money. Wheeler was the only man who had any, an 
told me it was his bread and cheese, therefore could not part with 
it, as he did not know where he could get a further supply. 
M : : 
making the excuse that in the pool of water they usually grew 
either from the severity of the previous two winters’ frosts or — 
thing else, no fresh crops had grown for two seasons, and he 
unable to afford me any information where I might sblaiasil a 
ie day whilst oi “A the top of a high timbered hill 
in Stir Ph Scotland, I met a girl carrying a pail of water; I 
asked her where she got the “uae she said—‘ Doon there, but its. 
nae guid to drink.” I followed the path indicated, and this led me — 
to a quarry hole, the edge of which was overgrown with long det 
de ; 
over with slime, a clear greenish jelly. On patting a small quantity 
I 
of it under the microscope (I always carried a microscope wi with t mm | 
in my rambles), to my infinite joy - were the A. pelluc 
