184 THE MICROSCOPICAL NEWS. 
trouble to the microscopist when mounting in this medium. 
The process is a ready and satisfactory one for objects of this 
character; a mount of Fissidens bryotdes being washed, boiled, 
and the slide cleaned, ringed with white cement, and successfully 
completed in a little over half an hour. 
In the senior division Mr. Miles mounted in balsam sections of 
lung showing tuberculosis, and injected sections of the cortical 
layers of kidney with the malpighian bodies and urinary tubules 
or ducts. He also mounted slides of gamboge as fluid mounts, 
interesting as illustrating molecular motion, or what is known to 
microscopists as the Brownian movement, from Dr. Robert Brown 
having, in 1827, clearly demonstrated that this movement is com- 
mon to all bodies if they are sufficiently minute. Gamboge, Indian 
Ink, and Carmine, from their density approaching that of water, 
exhibit the phenomena very distinctly under a power of 300 
diameters. 
The minute particles are seen to move irregularly to the right 
and left, backwards and forwards, as if repelled by each other. 
This movement was seen to be still active, after a lapse of sixteen 
years, in a slide of gamboge, mounted by Mr. R. L. Mestayer, 
which he exhibited at a previous meeting of the section, clearly 
showing that evaporation is in no way connected with it. 
Excursion.—This Society had its second excursion this season 
on Saturday, April 21, 1883, when about thirty members paid a visit 
to Stalybrushes under the leadership of Mr. Wm. Stanley, F.R. MLS. 
This district, although a very fine one for its mountain scenery 
and bracing character of its atmosphere, is rather late for flowering 
plants, and does not offer many advantages for the searcher after 
pond-life ; only a few specimens of any interest being collected: 
notably, the Water Blinks, AZontia fontana ; the common Cotton 
Grass, Eriophorum angustifolium ; and the Water Ranunculus, 7. 
Lenomandi ; of pond life, Batrachospermum moniliforme ; Hydra 
viridis ; larve of the Water Beetle, Dytiscus marginals ; and the 
Fairy Shrimp ; but in spite of the great alterations which have 
taken place by the formation of four large reservoirs for the supply 
of water to the district, it is exceedingly interesting to the muscolo- 
gist, and two or three good finds were made. Mosses—Ducranella 
squarrosa, Philonotis fontana, Fontinalis squamosa, and Hylocomium 
fiagellare. 'Hepatics—Cephalozia fluitans (obtusiloba), Jungerman- 
nta spherocarpa, Nardia scalaris, and in nice fruit, Scapania 
undulata and Cephalozia bicuspidata. 
The party was accompanied by Mr. R. Stanley, J.P:, late chair- 
man of the Waterworks Committee, who, on reaching the key-house 
at the head of Walker Wood reservoir, explained the process of 
fish culture carried on by him during the last few years, and dis- 
tributed to the members present, several of the fertilized ova for 
future observation. 
