Note 438 — PHARMACOLOGIA. (continued 2)

The collection of the Materia Medica at the College of Physicians contains a beautiful specimen of native Camphor in the wood: having selected from it as perfect a crystal as I could find, I requested my friend and publisher Mr. W. Phillips, well known for his researches in crystallography, to undertake its examination; and he observes that “The crystal of native Camphor (in the wood) appears as a flat octohedron; but the primary form is a right rhombic prism of 51° 36′ and 128° 24′. by measurement with the reflective goniometer on cleavage planes: the octohedral appearance arises from the deep replacement of four of the solid angles of the prism, by as many planes.”