; 35 
 Aurust 25th. —** Microscopical Section.”—An evening on mounting 
‘ * microscopic objects, when practical instruction in some of the’ 
different methods of mounting objects for the microscope was 
given by the following gentlemen :— 
« 
Mr. Hennan showed how to mount diatoms as dry objects, i 
the course of which operation he gave a caution against using a pipe 
intaking them out of the store bottle, giving preference to a glass 
* He next illustrated tie modé of mounting in glycerine jely, 
ove of whe most vale le agents in preserving animal tissue or 
vegetable preparations; and pointed out that objects could be 
temporarily preserved in it, and laid by without fear of injury, 
until time could be found for finishing the preparation. 
Dr. Hatzrax gave instruction in his method of making 
shallow or deep cells for objects mounted in fluid, and detailed 
the experiments he had made with different substances to form a 
cell of any thickness, which should be permanent, and, at the same 
time, not be acted upon by the medium in which mounted. He had 
found a mixture of marine glue and shell-lac gave the best results. 
Several ingenious contrivances for removing minute objects 
from fluid, floating them on the slide in the exact position re- 
quired, as well as a modification of the turn-table for enabling the 
brush to be held steadily in a perpendicular manner, were also 
shown by Dr. Hatrirax. 
. Mr. Wonror showed how to fix cells with marine glue, and 
illustraisd the process of mounting dry objects, from the fixing 
; the cell to thethnishing the slide ready for the cabinet. For dry 
objects, he had found nothing so permanent as glass cells, or, 
what was far cheaper, brass rings, either of which could be easily 
: attached by marine glue, the most trustworthy cement for fixing. 
He had tried a great variety of cells, and found objections to all 
but glass and metal. 
Mr. Wonror also exhibited one of Dr. Mathews’ improved 
turn-tables for making shallow cells, and pointed out its supe- 
riority over the old form. 
The comparative value of different cements was discussed, 
_and several practical hints in minutize of mounting and prepara- 
tion were given by the same gentlemen during the evening. 
eee 
a Se 
¥ a 
nS: 
