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 supported the view of Bonomo and Cestoni, but made the mistake of identifying the itch parasite with the cheese mite. The great medical authorities of the eighteenth century, such as Hoffmann and Boerhaave, still recommended general treatment, and a long list of drugs might be compiled which were supposed to be suitable in the treatment of itch. Among these, luckily, some parasiticides were included, and, consequently, the disease did get cured by these, but the wrong things got the credit. About the end of the eighteenth century Hahnemann promulgated the theory that the "psoric miasm" of which the itch eruption was the symptomatic manifestation, was the cause of a large proportion of chronic diseases.

Some observers thought there were two kinds of itch, one caused by the acarus, the other independent of it. Bolder theorists held that the insect was the product of the disease. The dispute continued until 1834, in which year Francois Renucci, a native of Corsica, and at the time assistant to the eminent surgeon d'Alibert at the Hôpital St. Louis, Paris, undertook to extract the acarus in any genuine case of itch. As a boy he had seen the poor women extract it in Corsica, as Bonomo and Cestoni had seen others do it at Leghorn, though his learned master at the hospital remained sceptical for some years. It was near the middle of the nineteenth century before the parasitic character of itch was universally acknowledged.