VI.—The epithelial sheath of hertwig in the teeth of man, with notes on the follicle and Nasmyth's membrane

The Epithelial Sheath of Hertwig was first fully described by yon Brunn, in 'Rodents, Carnivora, and Ungulates', and named by him. the "Sheath of Hertwig,” in acknowledgment of the previous demonstration by O. Hertwig of an epithelial investment of the developing teeth of some reptiles. This epithelial sheath has not been hitherto described as a complete organ in man, and in the present paper the author has endeavoured to show:— 1. That it is present in human teeth, and bears the same relation to the forming roots as that described in many mammalian orders by von Brunn.