Note 1 — CHAP. IV.
Reading edition
: I have collected into a note, which will be found in the appendix to this chapter, the opinions entertained by the Greeks and Romans upon this habit of the fresh-water fishes of India. See note B.
2: D. Hancockii, Cuv. et Val.
3: Sir R. Schomburgk's Fishes of Guiana, vol. i. pp. 113, 151, 160. Another migratory fish was found by Bose very numerous in the fresh waters of Carolina and in ponds liable to become dry in summer. When captured and placed on the ground, "they always directed themselves towards the nearest water, which they could not possibly see, and which they must have discovered by some internal index." They belong to the genus Hydrargyra, and are called Swampines.— KIBBY, Bridgewater Treatise, vol i. p. 143.
Eels kept in a garden, when August arrived (the period at which instinct impels them to go to the sea to spawn) were in the habit of leaving the pond and were invariably found moving eastward in the direction of the sea.—YARRELL, vol. ii. p. 384. Anglers observe that fish newly caught, when placed out of sight of water, always struggle towards it to escape.