(From and a day). A fever of one day's continuance only; diaria febris. The heat of the body is moderate, such as attends an excess of wine, or a violent passion. The pulse is somewhat full and quick, but soft and regular; the urine unchanged: neither is the complaint preceded by any sickness, yawning, propensity to sleep, or horror. It comes on suddenly, unattended with any pain of the head and stomach, nausea, burning heat, or inquietude. The disorder sometimes goes off without any apparent evacuation; but oftener by a free perspiration, or at most a pleasant moderate sweat. It generally arises from watching, solicitude, sorrow, anger, inebriety, fatigue, heat of the sun, or inanition, and usually terminates in one, at the furthest, in two or three days. Nature commonly effects a cure. The fever described by Lom-mius, and other ancient authors, under this title, is evidently an exacerbation of the common febrile accession, in consequence of some of the causes mentioned. There is, however, an ephemera of a different kind, marked by violent rigor, and succeeded by burning heat, which disappears at the end of the twenty-four hours, leaving only debility. It is the occasional recurrence of such ephemerae which has induced nosologists to establish a genus which they style erratica, but which seems to have no existence. We have seen such ephemerae frequently, without being able to trace their source. We have generally, however, had reason to suspect that they were owing to obstructed viscera, or at least connected with some internal disorder. They require no remedy but rest and warm diluting liquors. See Lom-mii Observationes Medicae. Sauvagesii Nosologia.

Ephemera dichomene; the febris erratica of noso-gists just mentioned.