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Show 1899.] ON TRICHROMATIC PHOTOGRAPHY. 929 actually overlap in their ranges and the Wood-cat is to be found far out on the plains, the Grass-cat is unknown in the wooded or riverine districts. The following are some measurements taken of two large males, the first having been killed as far back as 1873 and the second recently:- (1st) (2nd) Length, inclusive of tail 38 in. 37| in. Tail 12 12 Height before 15 13 Height behind 141 Girth of abdomen 16 14 Girth of neck 11 91 Length of head 6 Width of head 5 Weight of first (very thin) 13 lbs. I have heard of one that scaled 22 lbs. November 28, 1899. Dr. HENRY WOODWARD, F.E.S., V.P., in the Chair. Mr. Oldfield Thomas exhibited the skull of a Baboon recently obtained at Aden by Messrs. Percival and Dodson. It appeared to represent a new species allied to Papio hamadryas, but distinguished by its small size, the row of upper cheek-teeth being only 41*5 m m . in length. This species was proposed to be named Papio arabicus. Mr. W . Saville-Kent, F.L.S., F.Z.S., stated that he had devoted considerable attention since the meeting of the last session to the subject of trichromatic or three-colour photography as applied to the correct colour-registration of Zoological and Botanical subjects. With the aid of the lantern he submitted a series of examples upon which he had successfully experimented. These included various species of tropical butterflies, orchids, fishes, lizards, and birds. Among the slides displayed, that of a peacock's feather, in which the characteristic tints were reproduced with marked fidelity, was particularly referred to as a successful demonstration of the capabilities of the system. Gold and Silver Carp, Cuckoo Wrasses (Labrus mixtus), and other marine species, taken by Mr. Saville-Kent at the Plymouth Zoological Station^ yielded appropriate illustrations of the process as applied to the colour-registration of the more brilliant but notably evanescent hues of fishes. In the bird-section, especial prominence was given to the correct colour-portrayal of the gaily plumao-ed Australian finches Poephila gouldi and P. mirabilis. These were |