But urine of a proper colour, and which at the same time has white, smooth, and equable sediments, or certain cloud-like appearances, or substances swimming in the middle of a like kind, is of all others the best. Of these characters, the sediment is of the most importance; next, the substances swimming in it; and third, the cloud-like appearances on its surface; and, on the whole, of the substances which float in the urine, the more they sink downwards so much the better. * * * * * COMMENTARY. See Hippocrates (Prognost. ii, et de Vict. Acut. c. 46); Galen (Comment. de Crisibus, i, 12); Celsus (ii, 7); Theophilus (de Urinis); Actuarius (de Urinis); Abicianus (de Urinis; De Urinis secundum Syros, de Urinis secundum Persas, de Urinis Commentatio, ap. Phys. et Med. Græc. Minor. ed. Ideler); Aëtius (v); Avicenna (iv, 2, 1, Cantic. p. 1); Averrhoes (Collig. iv, 21); Haly Abbas (Theor. iv, 12, x, 10); Alsaharavius (Theor. viii); Rhases (ad Mansor. x, 30, and Contin. xxxi); Psellus (Opus Medicum.) Of the ancient authorities who have treated of the urinary discharges, Theophilus and Actuarius are most particularly deserving of attention. Besides the watery portion, the ancients distinguished three distinct substances in the urine: 1st, the hypostasis or sediment, which is the part that falls to the bottom; 2d, the enæorema, or substances which float in the watery part, but have not weight to subside; 3d, the nubeculæ, or cloud-like appearances seen floating on the surface, or as they may be called the scum. All the different appearances which these substances put on, including every imaginary shade of colour, are described with surprising minuteness, and connected with the morbid conditions of the system which gives rise to them. In fact, there is no part of our task which we are obliged to discharge in so unsatisfactory a manner to ourselves as the present; for, to give our readers anything like a competent exposition of the knowledge possessed by the ancients on the morbid appearances of the urine, we would require to transfer to our pages the whole contents of the large treatise of Actuarius. We shall now give a few extracts from his work and that of Theophilus. They state that the urine of sedentary persons has more sediment than that of persons who pursue an active course of life; that the urine of women, from this cause, has generally more sediment than that of men; that of children more than that of adults; and that of persons who live grossly, than the urine of temperate persons. Theophilus thus delivers the characters of oily urine. When in fevers the urine assumes the colour of oil, it indicates that the fat of the body is melting down. When the appearances of the urine resemble oil still more, it indicates an increase of the melting of the fat; and when the urine in consistence and colour appears exactly like oil of a dark colour, it prognosticates a collapse and death.