On the Distribution of Volcanic Debris over the Floor of the Ocean,—its Character, Source, and some of the Products of its Disintegration and Decomposition

During the present session I propose to lay before the Society several papers on subjects connected with the deposits which were found at the bottom of the oceans and seas visited by H.M.S.Challenger in the years 1872, 1873, 1874, 1875, and 1876.