His day’s work completed, the camera-man takes his negative film, which is contained in the take-up box of the camera to protect it from the light, to the factory. The film taken from the camera now faces the following steps: the development, washing, and, finally, fixing, thus producing a “negative” from which the “positive” prints used for exhibition purposes are to be made. The development of the negative takes place, of course, in a “dark room,” that is, dark in the photographic sense, the sole illumination being that of lamps providing a pure red light. The negative strips are wound spirally about pins on a rectangular rack, thus making it possible to wet the entire surface of the film simultaneously and equally when the rack is submerged in the developing solution. Metal and hydroquinine are the chemical agents most active in the developing solution most commonly used, soda sulphite, soda carbonate, potassium, metabisulphite, and water completing the formula. But even for standard work there are varieties of developing-baths, while to handle film taken under out-of-the-ordinary conditions still further changes are made. It is in his ability to meet varying circumstances that the factory executive shows his mettle. Test developments may be made on a few inches of film to indicate the exact process to be followed. The washing of the film, and its submersion in the “fixing”-bath are the next items, also familiar to the ordinary photographer. The “fixing”--that is, submersion in a solution of sodium hyposulphite--renders the negative immune to the light, after which it is once more washed, this time to remove the “hypo” of the fixing-bath. The negative may now be treated with a diluted solution of glycerine, which renders it soft and pliable, for there is much wear in store for this negative. We have seen previously how each scene taken during the day was numbered to aid the producer in assembling the picture in the proper order. The negative strips are now assembled in a complete strip and viewed by the executives of the company before the first positive print is made. This initial inspection will, like as not, show that some of the scenes must be retaken, either because of poor photography or for some other reason not noticed by the director at the time the original scene was taken. “Retakes” are, naturally, not popular with the men who pay the bills, though they are often due to natural causes beyond the power of the director or camera-man to forestall. As picture producers always take a good deal more film than will be used in the subject shown later in the theaters, this viewing of the negative will also aid in bringing the picture down to the required size and in deciding on the printed inserts needed, though it is also probable that a good deal of cutting, reassembling, titling, and so on, will be done after the first positive print is made.