648 Cf. DãOrbigny, Alc., Cours ûˋlûˋm. de Palûˋontologie, etc., I, pp. 144ã148, 1849; see also Sharpe, Daniel, On Slaty Cleavage, Q.J.G.S. III, p. 74, 1847.
649 Thus Ammonites erugatus, when compressed, has been described as A. planorbis: cf. Blake, J. F., Phil. Mag. (5), VI, p. 260, 1878. Wettstein has shewn that several species of the fish-genus Lepidopus have been based on specimens artificially deformed in various ways: Ueber die Fischfauna des TertiûÊren Glarnerschiefers, Abh. Schw. Palaeont. Gesellsch. XIII, 1886 (see especially pp. 23ã38, pl. I). The whole subject, interesting as it is, has been little studied: both Blake and Wettstein deal with it mathôÙeôÙmatôÙiôÙcally.
650 Cf. Sir Thomas Browne, in The Garden of Cyrus: ãBut why ofttimes one side of the leaf is unequall unto the other, as in Hazell and Oaks, why on either side the master vein the lesser and derivative channels stand not directly opposite, nor at equall angles, respectively unto the adverse side, but those of one side do often exceed the other, as the Wallnut and many more, deserves another enquiry.ã
651 Where gourds are common, the glass-blower is still apt to take them for a prototype, as the prehistoric potter also did. For instance, a tall, annulated Florence oil-flask is an exact but no longer a conscious imitation of a gourd which has been converted into a bottle in the manner described.
652 Cf. Elsie Venner, chap. ii.