A thick mass of bedded schists, as I have described in more than one paper, occupies the highest position among the socalled metamorphic rocks of the Alps. With the exception of some gneisses—so far as I know of a porphyritic character, and almost certainly intrusive granites modified by pressure— and various green schists, which, in part at least, are basic igneous rocks, similarly affected, the group, which may be traced from one end of the chain to the other, consists of altered sediments.