The apparatus is reversible, and may be used for making negatives as well as for projecting positives. In its new form it is easily transportable and is no more bulky than an ordinary 5 by 7 inch apparatus. Nothing is simpler then than to carry it on a journey, if one desires to make his own negative bands. Since the sensitized film has to be protected against the light during its entire travel, two magazines have been arranged (Fig. 1). One of these, A, which is fixed upon the top of the camera, contains the clean film, while the other, B, which is placed beneath the objective, receives the strip after it has been acted upon by the light. A train of toothed wheels, C (Fig. 2), actuates the roller of this second magazine. This arrangement may, moreover, be utilized also when projections are made, if one does not desire the band to float in measure as it unwinds behind the objective. As the upper magazine is entirely closed when it is placed upon the apparatus, it is necessary, in order to prepare for taking a negative, to pull out a few inches of the film, pass the latter over the guide roller and fix the extremity to the winding roller in the lower magazine. It is clear that we can have any number of magazines whatever for carrying about, all charged, just as one carries the frames of his ordinary camera. Chronophotography presents no more difficulty than ordinary photography as regards the taking of negatives, and the amateur who has not the proper facilities for developing and printing the latter can have these operations performed by a professional. Animate projections are beginning to be introduced into parlors, and some day will entirely replace the magic lantern therein. The excitement caused by the catastrophe at the Charity Bazar is now calmed, and it has been ascertained that the accident was not due to the lamp of the projector, but to a carelessly handled can of ether. So the extension of this sort of spectacle, momentarily arrested, is taking a new impetus, which will be further aided by the apparatus under consideration, for the description of which and the illustrations we are indebted to La Nature. THE RECLAIMING OF OLD RUBBER. By HAWTHORNE HILL. The complaint of high prices of India rubber is as old as the rubber industry, one result of which has been an unceasing effort to discover a practical substitute. Never was the secret of the transmutation of metals sought more persistently by ancient philosophers than the secret of an artificial rubber has been by modern chemists, but, thus far, the one search has been hardly more successful than the other. One discovery has been made, however, by which our rubber supplies have been so far conserved that, for the want of it, we might be obliged now to pay double the current prices for new rubber. This is the reclaiming of rubber from worn-out goods, in a condition fit for use again in almost every class of products of the rubber factory.