That all fishes are of a colder and more humid temperament is obvious. Those that are found among rocks are the best of all, being of easy digestion, furnishing good juices, and being moderately moistening when their flesh is not hard. Of those that do not abide among rocks, those that abide in the sea are much better than those that dwell among mud, or where rivers meet the sea. But still worse are those which are found in marshes and stagnant parts of the sea. In particular, the mullet (_capito_) being a sea fish, is moderately sweet, not very indigestible, and furnishes good chyme; but the blood formed from it is thin and weak. So it is also with the bass (_lupus_). The surmullet, as being a sea fish, is harder than the others, friable, digestible, nutritive, sweet, and free of fat. * * * * * COMMENTARY. Ancient authors make mention of whole nations of mankind that subsisted entirely upon fish. For an account of the Ichthyophagi, see Herodotus (iii, 20); Pliny (xi); Strabo (Geogr. xv); Diodorus Siculus (iv, 15); Ptolemæus (Geogr. iv); Arrianus (in Indicis); Solinus (Polyhistor, lxv); Philostratus (in Vita Apollonii, iii.) The description given of them by Diodorus is the most circumstantial and interesting. He says that the simplicity of their diet preserved them free from diseases, but that they were short-lived. A very interesting, and seemingly a very authentic account of the fish-eaters on the borders of the Red Sea is also given by Agatharcides. (Ap. Photium.) Pliny states that fish was used by his countrymen as food from the building of the city. (Hist. Nat. xxxii, 10.) Eustathius says that, in the heroic ages, it was seldom used but in cases of want. (Ad Iliad. v, 487.) It would appear that fish was generally high priced in Greece. See Athen. (vi, 12, ed. Schweigh.) In the luxurious days of the Romans, the rage for fishes esteemed as rare was excessive. See Horace, Juvenal, and Martial (pluries.) Hippocrates thus details the dietetical qualities of fish. Speaking generally, then, he says fishes are light food, both when boiled and roasted, by themselves or with other things. They differ from one another as follows: Those which live in lakes, the fat, and river fishes, are heavier; of sea fish, such as are found near the shore are lighter, and those which are well boiled are lighter than such as are roasted. The stronger kind, therefore, are to be given when our object is to recruit, but the lighter when we wish to attenuate or reduce. (De Affect. 46.) Celsus ranks fish among those things which hold an intermediate place between articles of a strong and of a weak nature. He thus distinguishes them from one another: “Levior piscis inter saxa editus, quam in arenâ, levior in arenâ, quam in limo: quo fit ut ex stagno, vel lacu, vel flumine eadem genera graviora sint: leviorque, qui in alto, quam qui in vado vixit.” Plutarch states that fish is much more easily digested than flesh. (Sympos. iv.)