Dealing with what Mr. Hummel said was generally considered by amateurs as the most uninteresting item of stereoscopic work, viz., the theory of binocular vision, the lecturer said that about 2,000 years ago Euclid studied and wrote on binocular vision, but he, of course. knew nothing of photography with a binocular camera, He, however. demonstrated the fact that each eye saw differently when looking at an object, and that it was union of ' these dissimilar pictures that the eyes saw the object as a whole, standing out as in nature, The object of stereoscopic photography was to enable the eyes to see in a photograph what they see in nature and with the same solidarity. This could not be done with the ordinary single lens camera,
Text read from the printed page and cleaned; old type leaves the occasional error.