Some Salient Points in the Science of the Earth

by Sir John William Dawson

Fig. 16.—Joint of a Crinoid, having its Pores injected with a Hydrous Silicate. Upper Silurian Limestone, Pole Hill, New Brunswick. Magnified 25 diameters.

Fig. 17.—Shell from a Silurian Limestone, Wales; its cavity filled with Hydrous Silicate. Magnified 25 diameters.

Fig. 18.—Casts of Canals of Eozoon in Serpentine, decalcified and highly magnified.