CONSTANT READER asks: "1. Is it possible to photograph from a moving vessel, and how? 2. Can I take photographs of microscopic specimens with an ordinary camera, and will you please describe the method? 3. How can I photograph monuments so that they will not show black in the picture? 4. What make of plates is the quickest? 5. How can I photograph a mantel-piece in a hall without using a flash-light? The hall is rather dark." 1. One can easily photograph objects from a moving vessel by using quick plates and making the exposure instantaneous. Successful snap-shots, but not artistic pictures, have been and can be made from moving trains. 2. An article will soon be published on microphotography for amateurs. The process requires too long a description for the space devoted to queries. 3. A cloudy day--not heavy clouds--is the better time for photographing monuments. A rather slow plate and a short time exposure will give better detail, and render the monument or figure with correct color value. Use orthochromatic or nonhalation plates. 4. The rapidity of the plate is marked on the box. Some brands of plates are marked with the sensitometer number, like the Stanley, Carbutt, Seed, etc., and others are marked with a letter like the Cramer. The sensitiveness of the Stanley, which is marked "Sens. 50," and the Cramer "C" plate is about equal as to rapidity. 5. If you cannot use a flash-light for the mantel, try a long exposure by lamp-light. Place the lamp, which should give a clear, brilliant light, so as to illuminate the wood-work without giving strong shadows. If one lamp is not sufficient to light the whole surface, take two, but place them so that the light from each comes from the same direction. A reflector back of the lamp helps the lighting. A shallow tin pan, if bright, makes a good reflector if the genuine article cannot be obtained.