This instrument is offered primarily to meet the demand for an ophthalmoscope that can be carried conveniently in one's pocket without a box or case. It consists of a frame with two arms, which swing on a hinge-joint. The arms carry two mirrors, which are so placed that when the instrument is closed, the mirrors lie face to face, and are thus protected from injury and dirt. When the instrument is open one arm acts as a handle for the other. In the joint there is a spring bolt, which fastens the

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... joint tightly when the mirrors lie Open. face to face, and also locks the joint when the instrument is open; this spring bolt is loosened by pressing a little knob. The arms are nickel-plated; on the outside this plating has a high polish, on the inside it has a dull finish, so that this metal part will not reflect light. The parts which form the backs of the mirrors are lacquered black. The mirrors are circular, with a diameter of 1 3-16 inches; the concave mirror has a focal length of 11 inches. Back of the concave mirror, a wheel is placed in which there are five lenses, a +2 D., a +4 D., for use in making examinations by the indirect method, a +8 D. for use in examining on levels in front of the retina, a -3 D. for the unskilled user, who accommodates when making a direct examination, and a -10 D. Closed. for examining myopes; there is also a hole in the wheel. The silvering of the mirrors at the center is removed in a circular space of 3/32 of an inch in diameter; this arrangement was observed particularly because of the advantages offered by such mirrors for retinoscopy. The completeness of the instrument will suggest itself. It is not a refracting ophthalmoscope with its many combinations of lenses, and, indeed, who in the present day of accurate refraction wants a refracting ophthalmoscope? The instrument is not intended to take the place in the ophthalmologist's office of his Morton. It is so compact that it weighs less than two ounces; it is % inches thick, 2% inches long when closed. It is solid, substantial and of neat finish, and can be sold at a very low price-an advantage which will be particularly considered by students.