there never had been, upon ye 4th. ie ye little toe of ye right foot, as I remember, there has been one but it haveing fallen off about 6 Months since it came no more but left ye Naile very little different from Naturall. This horny substance grew not out of ye end of ye fingers but was as it were a thickening of ye Naile, wch instead of growing out <s>at<\s> in length increased in thickness but rose not up strait in a perpendicular line to ye finger but as it augmented bended forwards & soe grew somewhat into ye shape of a birds claw but yt it was not taper & sharp like it but blunt at ye end & almost of ye same bigness all along & full of pritty deep chaps in ye convex part, but ye concave was without any he had noe sense in ye horny part it self, for I saw ye peices before mentioned brokn of by wresting severall ways, but he com= plained of paine when bending ye upper part the part yt Joyned on to his finger was not held very firme & steady & those of his feet were soe tender yt he complained upon very gentle touching of them but ye sensibility <s>is<\s> was not in ye horny excrescence but in ye part where it joyns on to ye flesh ie where the naile did formerly grow.
Account of a young lad in Paris who had 'horns' growing from his hands and toes by Mr Locke, 24 May 1678. From The Royal Society, CLP/13/5