Many are deterred from taking up this most fascinating branch of photo graphy because of its supposed difficulty, which, how ever, is more imaginary than real, as anyone who can develop a bromide print may, with every prospect of success, attempt the production of a lan tern slide, for in no respect does the latter present any greater technical difficulty than the former. Both are positive prints, the composition of the image in either case, and also the method of producing it, being practically identical, the chief difference being that the bromide print is supported on a paper basis.