To this beautiful specimen of the art we may certainly refer as a proof that it is quite possible to obtain upon paper the greatest nicety of detail; in short, every minuteness that can be desired, or ought to be attempted.] _Stereoscopic Angles._--I think there can be little doubt that MR. T. L. MERRITT (Vol. viii., p. 110.) has solved the problem as to stereoscopic angles: there can be no reason why one angle should be used for _near_ objects, and another for _distant_. A _true_ representation of nature is required: and, as we cannot view any object with one of our eyes eighteen or twenty feet separate from the other, so it appears to me a true picture cannot be obtained by taking two views so far apart. The result must be to _dwarf_ the objects; and, in confirmation of this, I may state that I was not convinced that the stereoscopic views were taken from nature till I understood the cause of their reduction. All views that I have been able to purchase, of out-door nature, appear to me to be taken from models, and not from the objects themselves. A view of a tower conveys the idea, not of a tower of stone and lime, but of a very careful model in cardboard; and this is exactly what might be expected from taking the views at so wide an angle. A church is seen, as it would be seen by a giant whose eyes were twenty feet apart, or as we would see a small model of it near at hand. I hope that some of your photographic correspondents will settle this question, by taking views of the same object both by the wide and close angle, and, by comparing them, ascertain which conveys to the mind the truest representation of nature. T. B. JOHNSTON. Edinburgh. _Sisson's developing Solution_ (Vol. vii., p. 462.).--Will you be so good as to ask MR. SISSON if he finds the above to answer as a bath to plunge the plate _into_, instead of pouring on, as in the case of pyrogallic? He is entitled to the warm thanks of all photographers for the discovery of a solution which produces such pleasing tints with so much ease; and it needs but the qualification I inquire after to render it perfect. I have used it when at least three weeks made, and am not sure that it is not even better than when fresh. S. B. P.S.--Why not devote a little more space to this fascinating art in "N. & Q."? I think, if anything, it grows less latterly. _Multiplying Photographs._--In Vol. viii., p. 60., you reprint a communication from Sir W. Herschel which has appeared in _The Athenæum_. {158} It describes a method of printing from glass negatives, but there being no _cut_ renders the meaning somewhat obscure.