Note 520 — Chapter III · ENATION.
Reading edition
See C. Morren, "Consid. sur les déformations," &c., in 'Bull. Acad. Belg.,' 1852, tom, xix, part 3, p. 444; and as to ferns, see Moore, 'Nature-Printed British Ferns,' 8vo ed., where numerous illustrations are given.