PROCEEDINGS OF SOCIETIES. 
35 
certain points of the reflected image. Signor Govi, Professor of 
Physics at the Royal University at Rome, proposes to cover with a 
thin layer of gold the reflecting surface of a prism, and to apply upon 
this, with Canada balsam, a second prism with like angles. Although 
this layer of gold is sufficiently transparent to allow the luminous 
rays to pass, its power of reflexion is considerable, and it gives 
images of great brightness. We have thus a perfect means of super- 
imposing, without fatigue to the eye, two different images— the one 
direct, and the other reflected. The principle is the application of 
that property of thin plates — metallic or otherwise — to transmit simul- 
taneously direct rays, and to reflect rays which arrive obliquely from 
another source. 
CORRESPONDENCE. 
“Some One” — An Advocate for the 180°. 
To the Editor of the * Monthly Microscopical Journal .’ 
Sir, — With an anonymous correspondent in the £ American Natu- 
ralist ’ I shall not revive a discussion, that has been closed on an 
optical question. 
When I guessed that some one might come forward to argue Mr. 
Tolies’ 180° to be right, I hardly expected that an advocate would 
appear. This enlightened one states, that with a dry object on the 
cover with 180° no distance is involved, ignoring the fact that 180° 
below the surface must be the result of 180° on the front lens ; and if 
there is no distance in the one case, there can be none in the other. 
But as there is a front distance *013 in the Jrth, the triangle is a 
practicable fact. 
This advocate having, either not the sense or the will to see this, 
rather than risk his credit, conceals himself ; his defence is, however, 
a superfluous one, for I have no wish to deprive Mr. Tolies of any 
honorary degrees that his policy may tempt him to claim ; and if 
“Some One ’’proposes that 180° is to be emblazoned upon his escutcheon, 
I will be the foremost to raise my hand to vote that it shall be done. 
Yours truly, 
F. H. Wenham. 
PROCEEDINGS OF SOCIETIES. 
Royal Microscopical Society. 
King’s College, December 2, 1874. 
The minutes of the preceding meeting were read and confirmed. 
A list of donations to the Society since the last meeting was read, 
and the thanks of the Fellows were voted to the donors. 
The Secretary announced that the Council had unanimously re- 
solved to support a proposal that Col. Dr. J. J. Woodward, of the 
United States Army Medical Department, be elected an honorary 
