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Although instances of human bodies nearly entire, united side by side, or back to back, or otherwise, are by no means rare in the collections of anatomists; and although such a conjunction is generally not connected with any peculiarity in the organs which compose them, and lead the physiologist to anticipate nothing curious in their internal configuration;—yet, where some parts are found double, and others single, the resources of nature become apparent in adjusting parts which have naturally no connexion. Such is the instance here described; and it appears peculiarly interesting, from the consideration, that the system of deviation was apparently compatible with life; for if the difficulty of the birth had not proved almost immediately fatal, the complexity of the structure would probably have formed no impediment to its existence. This curious production had two heads, placed side by side, united to one body, with two legs and two arms. The countenance of the one appeared to the author to be male, and of the other female; and the conformation of the organs of generation, which partook of both sexes, confirmed that persuasion.

Description of an extraordinary human fœtus. In a letter from Mr. Benjamin Gibson, Surgeon, to H. Leigh Thomas, Esq. F. R. S