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408 THE PHOTOGRAPHIC NEWS.. [June 29, 1883. Bank post paper is also very useful for printing maps, &c., that require constant folding and unfolding, but it is rather too hard and unabsorbent to print well. The 1 above com prise the principal points requiring-the- attention of the photo-lithographer ; other minor ones will be noticed in due course. (To be continued.'). ■' ' ‘ ■ Zotes. The Year-Book of Photography for 1883., of which no less than 7,500 copies were' published, is out of print. Our edition next year will be 8,000. A feature of the next Exhibition in Pall Mall will be the introduction of a lantern entertainment dr exhibition; and such slides as the committee may pass will be shown on Monday evening, at about nine o’clock. A new Society, called the Coventry and Midland Photo graphic Society, has been formed at Coventry. The University of Durham confers upon Mr. J. W. Swan the degree of M.A., honoris causa, a dignity deserved quite as much for his improvements in carbon printing as for inventing the Swan Incandescent Lamp. Colonel Stotherd, R.E., who some years ago had charge of the Military Photographic School at Chatham, has been appointed Director-General of the Ordnance Survey at Southampton ; photo-zincography being extensively prac tised in the production of maps at Southampton, Colonel Stotherd is peculiarly well fitted for the appointment. The lens shade, which Mr. England was one of the first to employ, if not to introduce, is scarcely so well known as it deserves to be. Mr. England invariably employs it for landscape work, and if jointed, as shown in our pic ture, the shade may be depressed in front of the lens, to cut off every bit of glare on a sunny day. As the peak of a cap shades its wearer, and permits him to see more clearly, so the lens-shade allows the camera to conceive a more vivid image. Such an apparatus fixed to the front of the camera is far better than any make-shift arrange ment at the moment of exposure. Last week the officers of H.M.S. Vernon carried out some important torpedo experiments at Portsmouth, which were recorded by photography. The early submarine experi ments with charges of gun-cotton, dynamite, and gunpowder were all photogta; 1 u 1, and for this reason; the cone of water thrown up, if quickly recorded in the camera, affords a means of calculating how much water has been displaced, the height of the cone and its breadth at the base being registered by certain land-marks, or rather water-marks, in the picture. And the amount of water displaced is naturally an indication of the power of the explosive employed as a torpedo. In the case of plates which are equally suited for either mode of development, Mr. Warnerke invariably obtains a higher sensitometer number by the use of pyro developer; it being, of course, understood that full gradations of half tone are produced in each case. The movement in favour of distributing photographs of good pictures among elementary schools as a means of interesting children in art, is a most excellent one. A meeting was held last week at the home of Mr. F. Storr, in Mecklenburgh Square, when a committee was appointed to carry out the object. As the movement has the support of Mr. Ruskin, Professor Colim, Mr. Matthew Arnold, Mr. W. B. Richmond, and other well-known men, it comes before the public under good auspices. It is proposed to purchase about a hundred pictures (framed) to constitute a sample collection, and to publish a descriptive catalogue for circulation among managers of schools, masters, and mistresses, giving full particulars of the cost of each picture, the place where it may be bought, and the manner and expense of framing. Apropos, it is singular that so few of our artists make use of photography as a means of reproduction. Even those who do have their pictures, previous to exhibition, photo graphed, impose a condition that the negative shall be destroyed after the required number of prints have been made. Apparently, this objection does not exist on the Continent, for at the present moment, in the windows of some of the London photographic dealers, are to be seen photographs of the principal pictures in this year’s Salon. On the other hand, such a thing as a photograph of a pic ture in the Royal Academy is unknown. We believe that some artists have a notion that the popularizing of a pic- tuio detracts from its value, on the ground that selfish buyers are comforted by the possession of something of which no other person in the world has a copy. This idea is totally erroneous. So far from the value of a picture being lessened by its being photographed, the reverse is the case. At the last meeting of the Chemical Society, Messrs. J. H. Gladstone and A. Tribe detailed the result of some experi ments as to the action of light on sugar. The conclusion arrived at was that the conversion of cane sugar into glucose was retarded, and took place with extreme slowness when the solution was exposed to light. Light also seems to partially arrest the development of fungoid growths in a solution of cane sugar exposed to atmospheric air.