An Invisible Monkey

Tbere are many animáis, especlally btrda and insects, which mimic In their colors and shapes the natural objects amid which they dweil, and thus frequently escape the eyes of their enemies; but, as Dr. Ly dekker sys In Knowledge, "Until quite recently no case was known where a monkey, for the sake oí protection, resembled in form or coloration either some other animal or an inanimate object." Such monkeys were discovered by Dr. J. W. Gregory during his recent Journey in East África. Near relatives of the monkeys seen by hlm have long been known to naturalists, and have excited surprise by the brilllant contrast of the black fur covering their body and llmbs wlth the snow-white mantle of long, süky halr hanging from their shoulders and the equally white plumes on their talls. This contrast. Dr. Oregory found, serves to render the animáis practically lnvisible.for the trees which they inhabit have black sterns, and are draped with pendant masses of graywhite lichen, amid which the monkeys can hardly be disttngulshed.