[Footnote 2: _Transactions Linn. Soc._ vol. iii. p. 63. It is remarkable, however, that this discovery of Daldorf, which excited so great an interest in 1791, had been anticipated by an Arabian voyager a thousand years before. Abou-zeyd, the compiler of the remarkable MS. known since Renandot's translation by the title of the _Travels of Two Mahometans_, states that Suleyman, one of his informants, who visited India at the close of the ninth century, was told there of a fish which, issuing from the waters, ascended the coco-nut palms to drink their sap, and returned to the sea. "On parle d'un poisson de mer que sortant de l'eau, monte sur la cocotier et boit le suc de la plante; ensuite il retourne à la mer." See REINAUD, _Relations des Voyages faits par les Arabes et Persans dans le neuvième siècle_, tom. i. p. 21, tom ii. p. 93.] There is considerable obscurity about the story of this ascent, although corroborated by M. John. Its motive for climbing is not apparent, since water being close at hand it could not have gone for sake of the moisture contained in the fissures of the palm; nor could it be in search of food, as it lives not on fruit but on aquatic insects.[1] The descent, too, is a question of difficulty. The position of its fins, and the spines on its gill-covers, might assist its journey upwards, but the same apparatus would prove anything but a facility in steadying its journey down. The probability is, as suggested by Buchanan, that the ascent which was witnessed by Daldorf was accidental, and ought not to be regarded as the habit of the animal. In Ceylon I heard of no instance of the perch ascending trees[2], but the fact is well established that both it, the _pullata_ (a species of polyacanthus), and others, are capable of long journeys on the level ground.[3] [Footnote 1: Kirby says that it is "in pursuit of certain crustaceans that form its food" (_Bridgewater Treatise_, vol. i. p. 144); but I am not aware of any crustaceans in the island which ascend the palmyra or feed upon its fruit. Birgus latro, which inhabits Mauritius and is said to climb the coco-nut for this purpose, has not been observed in Ceylon.] [Footnote 2: This assertion must be qualified by a fact stated by Mr. E.A. Layard, who mentions that on visiting one of the fishing stations on a Singhalese river, where the fish are caught in staked enclosures, as described at p. 212, and observing that the chambers were covered with netting, he asked the reason, and was told "_that some of the fish climbed up the sticks and got over_."--_Mag. Nat. Hist._ for May 1828, p. 390-1.]