Of the particular groups of symptoms which have been brought together under the great class, continued fever, it is impossible to discover any kind of principle which has led to the formation of the distinct assemblages that have been made, or to their nomenclature when thus collected. Synocha, typhus, synochus, are the three genera which modern nosology, in the power and pride of its strength, has put forth as at once distinctive and exhaustive of this class of disease. The aggregate phenomena constituting synocha, form just that particular series which is common to some forms of fever and to all acute inflammations: namely, “Calor plurimum auctus, pulsus frequens, validus, et durus, urina rubra, sensorii functiones parum turbatæ.” The train of symptoms thus brought together do not alone form any variety of fever. The second group of symptoms forming typhus—“morbus contagiosus, calor parum auctus, pulsus parvus, debilis, plerumque frequens, urina parum mutata, sensorii functiones plurimum turbatæ, vires multum imminutæ:” and the third, forming synochus,—“morbus contagiosus, febris ex synocha et typho composita; initio synocha, progressu, et versus finem, typhus,” independently of their being brought together and named according to no known or even assigned principle, are liable to the further and the fatal objection, that they do not even occur in nature. Even Dr. Wilson Philip, who labours to reconcile to nature and to improve in accuracy and comprehensiveness these classifications and definitions, expressly admits that a simple synocha or typhus is a fever which we rarely, if ever meet with: for that however high the inflammatory symptoms at an early period may be, those of typhus always, at least in this country, sooner or later supervene; and that however well marked the symptoms of typhus may be in the progress of fever, in almost every case, the first symptoms are more or less inflammatory; that the fevers mentioned by authors, under the names synochus and typhus, are in fact no other than varieties of the synochus; that when the symptoms of debility predominate, the fever has been termed typhus; that when, on the contrary, the inflammatory symptoms are most remarkable, and present through the greater part of the disease, it has been called synocha.[19]