A is the microscope proper and is, in all respects, similar to the instrument with which we are familiar, except that its mirror and condenser have been removed. In the fitting provided for the condenser a second microscope is arranged. [Illustration] This consists of a tube D, an objective F, an ocular C and an inner sliding tube E, the whole fits into the metal case B, G is a stage on which the object is placed and below G, if necessary, a condenser may be fitted. The instrument owes its remarkable magnifying powers to the fact that the additional microscope B, forms a magnified image of the object on the stage G, at the opening in the stage of the microscope A. This magnified image is still further enlarged by the original microscope. In other words, the power of one microscope is employed on that of another. The apparatus as we have described it gives enormous magnifications and it is possible, by using a suitable combination of objectives, to obtain a magnification of ten thousand diameters. Expressed in non-technical language, a circle whose actual diameter is equal to the thickness of the paper upon which these words are printed, could be so magnified by the super-microscope that it would appear to be as thick as ten thousand similar pieces of paper but, with this enormous magnification, it is obvious that, even with such a marvellous instrument, the whole of the circle from edge to edge could not be seen at one time. With an ordinary microscope a magnification of one thousand three hundred diameters is considered highly satisfactory. So that there is a great probability of being able to see some of the minute objects which are known to exist, but which have, up to the present, eluded those who would view them, on account of their minuteness. There is a possibility also of discovering a new underworld of which no man has yet dreamed. The man who uses his microscope solely because of the pleasure he derives from it, rather than he who uses it because it is essential to his business or profession, will be more attracted by the micro-telescope. By this we do not infer that the instrument is not useful, as a fact it is of the greatest importance in certain cases, especially for Nature-study work, for the observation of minerals and to the chemist.