He prepares some of his sponges to show the spicules by preparing a surface then etching with hydrochloric acid. When the spicule show results in plaster of paris and rocklithes. One of this material showed the structure quite plainly. Sep. 17. Spent the day at Brumisky 18 miles south of Hamilton. Collected in the Majaba shales which weather down more at this place than around Hamilton. Gathered some good Archiphycus ladayi from the Clinton. The beds with this organism are about two feet thick and down through the rock the edges of the beds are marked with concentric markings which have some connection with the Archiphycus. I have gathered some of this. It could seem that either Archiphycus is a