Note 5 — Chapter I

Owen’s “Lectures on Comparative Anatomy,” 2nd. ed. p. 605. Carpenter’s “Physiology,” 645. “Woodcroft on Marine Propulsion,” note, p. 1, and drawing of Nautilus in frontispiece to Woodcroft’s “Steam Navigation.” See also an interesting paper, read at the Society of Arts on the 14th of April, 1858, by John MacGregor, Esq., M.A., Barrister at Law.