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Professor O.N. Rood, of Troy, has sent us some most interesting photographs, showing the markings of infusoria enormously magnified and perfectly defined. In a stereograph sent us by the same gentleman the epithelium scales from mucous membrane are shown floating or half-submerged in fluid, a very curious effect, requiring the double image to produce it.

These are still our chief favorites for scenery, for architectural objects, for almost everything but portraits, and even these last acquire a reality in the stereoscope which they can get in no other way. In this third photographic excursion we must only touch briefly upon the stereograph. Yet we have something to add to what we said before on this topic.

The field of photography is extending itself to embrace subjects of strange and sometimes of fearful interest. We have referred in a former article to a stereograph in a friend's collection showing the bodies of the slain heaped up for burial after the Battle of Malignano.

This muffled shape stealing silently into the solemn scene has already written a hundred biographies in our imagination. In the lovely glass stereograph of the Lake of Brienz, on the left-hand side, a vaguely hinted female figure stands by the margin of the fair water; on the other side of the picture she is not seen. This is life; we seem to see her come and go.

We have a glass stereograph of Bethlehem, which looks as if the ground were covered with snow, and paper ones of Jerusalem colored and uncolored, much superior to it both in effect and detail. The Oriental pictures, we think, are apt to have this white, patchy look; possibly we do not get the best in this country. A good view on glass or paper is, as a rule, best uncolored.

A double tube would be better, but that cannot be extemporised so easily. Have you ever tried a stereograph taken with the camera only the distance apart of the eyes? That must give nature. When the angle is greater the views in the stereoscope show us, not nature, but a perfect reduced model of nature seen nearer the eye.

There was more genius in it than in any structure of the kind I have ever seen, each length being of a special pattern, ramified, reticulated, contorted, as the limbs of the trees had grown. I trust some friend will photograph or stereograph this fence for me, to go with the view of the spires of Frederick, already referred to, as mementos of my journey.

The contents of this volume are: 'Bread and the Newspaper, 'My Hunt After the Captain, 'The Stereoscope and the Stereograph, 'Sun Painting and Sun Sculpture, 'Doings of the Sunbeam, 'The Human Wheel, its Spokes and Felloes, 'A Visit to the Autocrat's Landlady, 'A Visit to the Asylum for Aged and Decayed Punsters, 'The Great Instrument, 'The Inevitable Trial. By Mrs.

Three or four successive reflections into a totally dark chamber will suffice in five or six minutes. When an important subject cannot be revisited it is well to take duplicates; the camera should be shifted laterally a few inches for a near object, or a few feet for a distant view, and then the two films will form a stereograph, if both succeed.

The veil was then again lifted, and the two great glassy eyes stared at us once more for some thirty seconds. The veil then dropped again; but in the mean time, the shrouded sorcerer had stolen our double image; we were immortal. We have now obtained the double-eyed or twin pictures, or STEREOGRAPH, if we may coin a name.