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THE BOOK OF THE LANTERN. 115 the transparency of such lights, and in a good lantern slide they should be represented by clear glass. TRANSPARENCIES ON COMMERCIAL GELATINE PLATES. For some inscrutable reason, it used to be the common opinion among those who ought to know something about the matter, that the gelatine process is unsuitable for lan- tern transparencies. The introduction lately of gelatine lantern plates into the market has done much to correct this error ; but still there are numerous persons who hold to the belief that the ordinary gelatine plate, such as is used for negative work, will not produce a good trans- parency. For years I have proved the contrary, and with regard to the quality of the transparencies produced, I have seen few to equal them. The first operator who turned out successful work of this character was Mr. Kennett, who has the greater honour of being the first to make gelatine plates a marketable commodity. His method of working was to employ a slow plate, to expose it under a negative in a printing frame for the fraction of a second in daylight, or for a longer time by lamplight, and to develop by either the alkaline or ferrous oxalate method. The plate was afterwards flooded with pyro and silver and toned with gold. The introduction of chloride plates, which give beautiful effects, may deter some from trying what can be done by ordinary gelatino-bromide plates. But for the amateur whose time is otherwise occupied during daylight, the latter process has many advantages. The chief one is that, while i 2