"Valentine Blanchard--Instantaneous views, wet collodion, 1856-65. Illustrations of a method of enlargement, as proposed by V. Blanchard, 1873. Modification of the Brewster stereoscope by Oliver Wendell Holmes. "Bullock (Bros.)--Photo-lithography, 1866 (Bullock's patent). "T. Bolas, F.C.S.--Detective camera, 1876. Negative photograph on bitumen, made insoluble by the action of light. Carbon negatives stripped by Wenderoth's process. "E. Clifton--Portrait of Daguerre. Crystallotype by J. R. Whipple, 1854. Specimens from "Pretsch" photo-galvano-graphic plates, 1856. "T. S. Davis, F.C.S.--A combined preparation and wash bottle for gelatine emulsion. Adjustable gauge for cutting photographic glasses. "De la Rue and Co.--Surface printing from blocks executed by Paul Pretsch, 1860. "W. England--Old Daguerreotype developing box. Old ditto sensitising box. Old camera, 1860, with rapid inside shutter. Instantaneous views in Paris, wet collodion, 1856-65. "Edinburgh Photographic Society--Archer's water lens. "James Glaisher, F.R.S.--Nature printing, taken over thirty years ago. "G. Fowler Jones--Prints from negatives by Le Gray's ceroline process. "R. Kennett--Skaife's pistolgraph. Globe lens. "Dr. Maddox--Some of the earliest gelatino-bromide negatives, by the originator of the process, 1871. "Mudd and Son--Collodio-albumen negatives. "R. C. Murray--Early Talbotype photographs, 1844-45. "H. Neville--Camera with Sutton's patent panoramic lens. "Mrs. H. Baden Pritchard--Impressions from pewter plates of heliographic drawing, by Nicéphore Niépce, 1827. Original letter, by Nicéphore Niépce, sent to the Royal Society, 1827. View of Kew, taken by Nicéphore Niépce, 1827. "H. P. Robinson--Heliographic picture, by Nicéphore Niépce, 1826. Photo-etched plate (from a print), by Niépce in 1827. Heliograph (from a print), by Niépce, 1827. One of the earliest printing-frames, made for Fox Talbot's photogenic drawing, 1839. The first nitrate of silver bath used by Scott Archer in his discovery of the collodion process, 1850. "Ross and Co.--One of Archer's earliest fluid lenses. The first photographic compound portrait lens, made by Andrew Ross, 1841. Photographic camera, believed to be the first made in England. "Sands and Hunter--Old lens, with adjustable diaphragm, by Archer, 1851. Old stereoscopic camera, with mechanical arrangement for transferring plates to and from the dark slide. "T. L. Scowen--Parallel bar stereoscopic camera. Latimer Clarke. "John Spiller, F.C.S., F.I.C.--The first preserved plates (three to twenty-one days), 1854. Illustrations of the French Pigeon Post.