The following are chiefly notes of a longer paper read April 5th, 1882, before the Société Vaudoise des Sciences Naturelles.

For some years familiar with the valleys of Anniviers, St. Nieklaus, Zermatt and Saas, the author has made a study of comparison between the above rocks in situ and erratic specimens of the same nature. The want of a laboratory and of more than a travelling microscope with polarising apparatus render his researches so imperfect that a more complete report upon these rocks must be deferred.