112 
POPULAR SCIENCE REVIEW. 
“ Paris Universal Exhibition. 
“ South Kensington, Oct. 16, 1867. 
— In reply to your letter of the 16th inst., I have to inform you 
that, so far as I am aware, no notice was sent to you respecting the testing 
of your lenses, nor is it now likely that they will he tested. 
I am. Sir, your obedient servant, 
‘‘ J. F. D. Donnelly, Capt. K.E., 
Secretary to the Juries. 
“Thomas Boss, Esq.” ^ 
To this letter and Mr. Ross’ further reply Dr. Diamond has refused pub- 
lication, and so for the present the controversy ceases. This seems to be 
only another proof of the small value and little meaning we can attach to 
the awarding of medals at our great Exhibitions. 
India-Ruhher for Mounting. — Much attention has been recently given to a 
solution of india-rubber in benzole, for the purpose of mounting photographs. 
Its advantages are said to reside in the rapidity and ease with which it can 
be applied, the leisurely way in which the prints can be mounted, the cer- 
tainty of adhesion, the absence of stains, its use as a preservative against 
the action of damps, and the complete avoidance of cockling.” It is alsQ 
said to keep the varnish on the surface of a print in a better condition, and 
to give it a brighter and finer appearance. 
Photographic Literature. — The Photographic Notes, one of the oldest of the 
photographic serials, will at the commencement of the New Year merge 
into a new illustrated weekly journal, to be called The Photographer : a 
Scientific and Art Journal. Amongst its contributors will be most of the 
best known photographic experimentalists, practitioners, and writers of the 
day. Thomas Sutton, B.A., George Dawson, the Lecturer on Photography 
at King’s College, Major Russell, Mr. A. H. Wall, and others, are to be 
regular contributors and in its list of occasional contributors will be found 
names which amongst photographers are familiar as household words.” 
To Preserve Photographs. — Mr. Henry Cooper, jun., to whom photogra- 
phers are indebted for many valuable suggestions, has recommended the use 
of a solution of parafine in benzole, with a small addition of gum dammar, 
dissolved in the same menstruum. H.e prepares the varnish by making two 
solutions, one of parafine dissolved in benzole, one drachm to the ounce, the 
other of one ounce of benzole and a drachm of dammar ; three parts of the 
parafine solution are added to one of the dammar, and the varnish is applied 
with a tuft of cotton wool. In mounting prints thus preserved the fact of 
the varnished surfaces being repellant of water will suggest the kind of 
material required for mounting. For this purpose nothing perhaps could be 
better than the above-mentioned solution of india-rubber. 
The Photographic Society of London has removed from King’s College, and 
will hold its future meetings at the Architectural Gallery, Conduit Street, 
Regent Street, in which handsome and spacious building so many Art 
Societies now have their permanent home. 
New Application of Electricity in Photography . — In Paris a very ingeniously- 
contrived piece of mechanism has been introduced, by which the cap of the 
lens is removed, at the expiration of a given time replaced, while at the 
