As regards acute diseases, they are either of such a kind as attack human beings individually, the exciting cause being injurious influences to which they were particularly exposed. Excesses in food, or an insufficient supply of it, severe physical impression, chills, over heatings, dissipation, strains, etc., or physical irritations, mental emotions, and the like, are exciting causes of such acute febrile affections; in reality, however, they are generally only a transient explosion of latent psora, which spontaneously returns to its dormant state if the acute diseases were not of too violent a character and were soon quelled. Or they are of such a kind as attack several persons at the same time, here and there (sporadically), by means of meteoric or telluric influences and injurious agents, the susceptibility for being morbidly affected by which is possessed by only a few persons at one time. Allied to these are those diseases in which many persons are attacked with very similar sufferings from the same cause (epidemically); these diseases generally become infectious (contagious) when they prevail among thickly congregated masses of human beings. Thence arise fevers1, in each instance of a peculiar nature, and, because the cases of disease have an identical origin, they set up in all those they affect an identical morbid process, which when left to itself terminates in a moderate period of time in death or recovery. The calamities of war, inundations and famine are not infrequently their exciting causes and producers – sometimes they are peculiar acute miasms which recur in the same manner (hence known by some traditional name), which either attack persons but once in a lifetime, as the smallpox, measles, whooping-cough, the ancient, smooth, bright red scarlet fever2 of Sydenham, the mumps, etc., or such as recur frequently in pretty much the same manner, the plague of the Levant, the yellow fever of the sea-coast, the Asiatic cholera, etc.
1 The homoeopathic physician, who does not entertain the foregone conclusion devised by the ordinary school (who have fixed upon a few names of such fevers, besides which mighty nature dare not produce any others, so as to admit of their treating these disease according to some fixed method), does not acknowledge the names goal fever, bilious fever, typhus fever, putrid fever, nervous fever or mucous fever, but treats them each according to their several peculiarities.
2 Subsequently to the year 1801 a kind of pupura miliaris (roodvonk), which came from the West, was by physicians confounded with the scarlet fever, notwithstanding that they exhibited totally different symptoms, that the latter found its prophylatic and curative remedy in belladonna, the former in aconite, and that the former was generally merely sporadic, while the latter was invariable epidemic. Of late years it seems as if the two occasionally joined to form an eruptive fever of a peculiar kind, for which neither the one nor the other remedy, alone, will be found to be exactly homoeopathic.