Note 1 — Chapter XXXV · ON THE DIFFERENT AGES OF THE METAMORPHIC ROCKS.
Reading edition
See notices of Savi, Hoffman, and others, referred to by Boué, Bull. de la Soc. Géol. de France, tome v, p. 317 and tome iii, p. 44; also Pilla, cited by Murchison, Quart. Geol. Journ., vol. v, p. 266.