A CONSIDERABLE area of nepheline-syenite was discovered about six years ago in Dungannon township, Hastings county, by Dr. F. Adams, who described the rock briefly in his Report on the Geology of a portion of Central Ontario, and more fully in the American Journal of Science.1 In 1896 corundum was found in the same region by Mr. W. F. Ferrier, and in the following year Professor W. G. Miller was instructed by Mr. Archibald Blue, director of mines of to examine and report upon the corundum-bearing rocks. In the course of his work it was found that the corundum occurred not only in ordinary syenites but also in nepheline-syenite. In November 1898 the present writer examined an outcrop of the latter rock for the Bureau of Mines on York branch of Madawaska River at