In apparatus there is not much to talk about, the Pantascopic camera being the chief novelty. There are several of the manufacturers exhibiting in the photographic department, but we could not reconcile ourselves to the circumstance of Mr. Dallmeyer not exhibiting in the right place. His name is honoured by photographers, and he should have honoured Photography by going in under her colours. If he must go to the "scientific department," he ought to have gone there with his scientific instruments alone, and shown his photographic apparatus in the place assigned for that purpose. True, he makes a handsome show, but that does not atone for his mistake. Photographers are queer animals--jealous of their rights, and as sensitive to slight as their plates are to light; and we fear we are ourselves not much better. A large majority of photographers stand by Mr. Dallmeyer, and very justly believe in his 1 and 2 B's as shippers do in A 1's at Lloyd's; and _his_ stand should have been in the photographic department. In other parts of the Exhibition building there are various subjects highly interesting to photographers. The chemical department has its attractions in samples of collodio-chloride of silver, prepared by Messrs. Mawson and Swan, for the opal printing process and the Simpsontype. Specimens of each type are also to be seen there; and there are other chemicals used in photography, even to dextrine and starch: the purity of the latter is known by the size and length of its crystals. In metallurgy there is also something to interest photographers. Messrs. Johnson and Sons exhibit some very fine samples of nitrate of silver, double and treble crystallized, silver dippers, chloride of gold, nitrate of uranium, and other scarce metals. Messrs. Johnson, Matthey, and Co. also exhibit some fine samples of nitrate of silver and chloride of gold; and some wonderful specimens of magnesium, in various forms, in wire and ribbon. One coil of ribbon is 4,800 feet long, and weighs 40 ounces; and there is an obelisk of magnesium about 20 inches high, and weighing 162 ounces. There are many other things in this case of great value which have a photographic bearing--amongst these a platinum boiler, valued at £1,500, for the concentration and rectification of sulphuric acid; a platinum alembic, value £350, for the separation and refining of gold and silver; also an ingot of platinum, weighing 3,200 ounces, and valued at £3,840. The exhibitors say that "such a mass of fused platinum is never likely to be again produced." The whole of the contents of Messrs. Johnson, Matthey, and Co.'s case of precious metals, most of which have a direct or indirect application to photography, are estimated at the enormous value of £16,000! Mining, too, has its attractions for us; and as we near the Nova Scotia division of the Exhibition building the needle of our observation dips towards a bar of pure gold, weighing 48 pounds, and valued at £2,200 sterling.