=Develop=, as in photo-lithography, either by means of warm or cold water, according to the coating upon the transfer-paper. The sensitised paper, where protected by the ink impression, has not been hardened by the action of the light, and readily parts with the ink and colouring matter. If the impression has been one from ordinary type it will now show in the form of white letters on a black ground. =Transfer to Stone=, and otherwise treat as an ordinary photo-lithographic transfer. ENGRAVED NEGATIVES FOR PHOTO-LITHOGRAPHY. In certain processes for the production of photo-relief blocks many operators prefer artificial negatives, in the production of which photography has played no part, but which are, on the contrary, the direct production of the artist’s hand. =Factitious Negatives= may be produced by coating a plate with a transparent but non-actinic coating, and by removing or erasing in a suitable manner designs may be copied without the use of a camera or lens. Professor Husnik and others have published different methods whereby the artist is enabled to transfer the creations of his pencil to zinc or stone, without resorting to the aid of the photographic negative process, although the subsequent operations may still entitle it to be styled photo-lithography. The process most likely to lead to success consists of _first coating_ a glass plate with a strongly iodised collodion, _sensitising_ as usual, well washing on both sides and drying. _To engrave_, lay the plate upon a black cloth, and the design may be traced and engraved upon the surface by means of etching points or needles. _Remove all_ loose particles of collodion from the plate by gentle brushing when the drawing is completed. _Immerse the plate_ a second time in the silver bath, and _develop_ with either pyrogallic acid or sulphate of iron developer. Husnik proposes to _first coat_ the plate with a solution of pure fuchsin, and afterwards with one of gum, and then engrave as previously indicated.[Y] [Y] Major Waterhouse has published the following ingenious method of transforming a drawing on paper into a photographic negative:—“A tracing, or drawing, is made in lithographic ink on tracing paper, using plenty of ink on the lines. The drawing is then placed on a board over a piece of blotting-paper, and brushed all over with a strong solution of aniline brown in water; when dry it is rubbed over with a tuft of cotton wool soaked in turpentine, which removes the ink without altering the coloured ground. The lines then appear clear on a dark reddish brown ground. The negatives thus obtained are good, but more suited for coarse than fine work.” It may be suggested, why not transfer the drawing direct to stone, and produce the necessary copies by lithography?—TRANS.