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THE BOOK OF THE LANTERN. 143 But for the amateur worker, to whom a few failures are not of any great moment, gelatine plates are best adapted. The silver bath, with its concomitant stained fingers and spoiled linen, is, I think, best left alone, unless the ama- teur adopts it as a necessary part of his photographic education. Those amateur photographers who are used to the work- ing of bromide paper, can produce lantern slides by an easier method than any of those just reviewed, namely, by means of the transferro-type paper which has lately been introduced by the Eastman Company, and with which many succeed in producing very fine lantern slides. This paper is coated with identically the same emulsion as that employed in the well-known bromide paper, and therefore the amateur has an advantage at the outset, of working with a medium to which he is accustomed; its develop- ment being the same as that of the ordinary bromide paper. It consists of an insoluble sensitised emulsion which is applied to paper having a soluble substratum of gelatine. The tissue is exposed under a negative to gaslight for the requisite time, and according to the density and other peculiarities of the negative in question; and is then developed in a ferrous-oxalate solution in the ordinary manner. It is then transferred to a piece of plain glass, which should be free from bubbles and other blemishes, while wet, being placed face down on the glass, and squeezed into contact. As much moisture as possible is then removed by the application of blotting paper. In about half an hour it will be ready for stripping ; but may