glandular configurations of many minerals, the cubical sulphide of lead, the ruby silver ore, etc., in all probability in water and by the shooting together of particles, as they become forced by some cause to dispense with this vehicle and to unite in definite external shapes.

But also all kinds of matter, which have been kept in a fluid state by heat, and have become solid by cooling, show internally, when fractured, a definite texture.

This makes us judge that if their own weight or the disturbance of the air had not prevented it, they would also have exhibited on the outer surface their specifically peculiar shapes. This has been observed in some metals on their inner surface, which have been hardened externally by fusion but are fluid in the interior, by the drawing off the internal