bearing this in mind, and making allowances for the spheroidal tendency of the mass, and the curvatures of the layers, a regu larity may be generally detected, not inferior to that of the crystalline schists. This structure is more or less visible in most published sketches of granitic cliffs; more particularly if the sea has excavated some portions of the perpendicular layers, in con sequence of a different composition rendering them more sus ceptible of decay and degradation. We have attempted in the subjoined figure to convey an idea of this arrangement, having for this purpose intentionally exaggerated the regu larity of the lines. Fig. 4. The lines corresponding with the gentle declination of the nearest hill towards the point, mark the manner in which the inclined face of the rhomboid slopes in one direction; while the greater slope of the hill towards the cliff is denoted by the lines on the sides of the indentations of the cliff, which run parallel therewith. Concerning the structure of the primary schistose rocks a few remarks will suffice. It may be divided, as in the ease of granite, into the concretionary and the internal; and the h I