RaineYj 071 Artificial Calculi. 
41 
It is further recommended tliat a set of gauges should 
permanently remain in the custody of the Society^ for the 
purpose of comparison^ in case of any question arising as to 
correctness of gauge. 
[Signed) George Jackson^ 
Charles Brooke. 
H. Perigal^ Jun. 
At a meeting of the Microscopical Society^ held on Wed- 
nesday^ the 11th of November^ 1857^, it was resolved — 
That this report be received and adopted. 
It was stated by a member of the sub-committee that the 
three principal London firms had agreed to adopt the pro- 
posed gauges^ which are now in the course of manufacture ; 
and that any microscope maker might obtain them from 
Mr. Joseph Whitworth^ of Manchester,, at the cost of £2 10^. 
the set. 
Precise Directions for the Making of Artificial CALCULiy 
with some Observations on Molecular Coalescence, 
supplementary to those on the same Subject, published in 
the ^British and Foreign Medico - Chirurgical Revieiv' for 
October, 1857. By George Hainey, Lecturer on Ana- 
tomy, &c., at St. Thomases Hospital. 
(Read December 9th, 1857.) 
Since my paper on the '^'^ Elementary Formation of the 
Skeletons of Animals, and other hard structures formed in con- 
nection with living tissues," was communicated to the ^British 
and Foreign Medico-Chirurgical Review,^ my attention has 
been directed to the improvement of the process for the ob- 
taining of artificial calculi therein given. In this respect I have 
fully succeeded, and am now enabled to give a formula and 
directions, which if strictly followed will never fail to ensure 
satisfactory results. I have, besides, in course of experi- 
menting, observed some facts with which I was unacquainted 
when I wrote my first paper. And as the subject is espe- 
cially connected with microscopical science, I am anxious 
of bringing it more directly under the notice of the Micro- 
scopical Society. My present process differs from that given 
in the Medico-Chirurgical lleview^ only in having the 
exact quantity of carbonate of potass indicated, and the 
