98 
MICROSCOPICAL AND NATURAL HISTORY SECTIONS. 
January 17 th, 1866. 
A. G. Latham, Esq., President of the Section, in the Chair. 
The following donations were announced : — 
Roper’s Catalogue of Microscopic Works, by the Author. 
Kolliker’s Manual of Human Microscopic Anatomy, by the 
Executors of the late George Mosley, Esq. 
Beck on the Microscope, by the Secretary. 
Six slides of seeds and fungi, by the Secretary. 
Several slides of sections of a Cidaris from the Indian Ocean, 
by Mr. Parry. 
The Secretary reported that he had made a catalogue of 
the collection of microscopical objects belonging to the 
Section. 
Mr. Sidebotham remarked on the best cement to use in 
forming cells for fluid preparations, and stated that gold size 
appeared to prevent the entrance of air bubbles better than 
Japan varnish or Brunswick black, which latter in time 
became porous, and also, from the evaporation of its turpen- 
tine, brittle. He said he and Mr. Thwaite were perhaps the 
first to use this method of mounting objects, and that he 
possessed slides of gold size cells made in 1844, which were 
still quite perfect, while those lie mounted with Japan black 
in 1850 were most of them spoiled, and that he had again 
reverted to the use of gold size for the formation of the cell, 
using Japan varnish for its final closing only. 
