If time is no object, we have an easy means of still further increasing the magnification. To do so we cut a thin sheet of copper in such a manner that it just fits our lens tube, in front of the diaphragm. Then in the very centre of the copper disc we make a hole with a “number one” needle, the hole is about one twentieth of an inch in diameter. Replace the convex lens in its cardboard holder and screw on the front portion of the camera lens. A trial will show that we have considerably increased the magnification but decreased the amount of light admitted by the lens, therefore we shall probably require an exposure as long as an hour. How about the bugbear vibration during such a long exposure is a natural question to ask. Unless the vibration is continuous, and that is unlikely, it is less likely to cause trouble during a very long exposure than during a short one, because it operates during a small proportion of the whole time. All kinds of objects can be depicted with the apparatus we have described. Minute shells and insects; parts of larger insects, their legs and wings for example; the feathers of birds; various rocks, crystals of all kinds; small flowers and their seeds; mosses, lichens and many kinds of fungus, in fact their number is limited only by the degree of ingenuity possessed by the photographer. Do not suppose that these low-power photo-micrographs are interesting only because of their size, the enthusiast who makes a collection will discover in his prints hidden beauty of which he had no conception when he looked at the originals. We have seen a very large number of low-power photo-micrographs, taken with very inexpensive apparatus, showing the wonderful sculpturing on the wing cases of beetles, some of them are marvels of design, yet, observed with the naked eye, many of the insects appear to be devoid of ornamentation.