But the adoption which Sauvages has made of this term, will not be regarded as an absolute prohibition from the employment of it here; since the _tremor palpitans_ of Sauvages should be considered rather as a palpitation of the muscles, whilst the motion which is so prominent a symptom in this disease, may be considered as a palpitation of the limbs.] * * * * * II. _A propensity to bend the trunk forwards, and to pass from a walking to a running pace._ This affection, which observation seems to authorise the being considered as a symptom peculiar to this disease, has been mentioned by few nosologists: it appears to have been first noticed by Gaubius, who says, “Cases occur in which the muscles duly excited into action by the impulse of the will, do then, with an unbidden agility, and with an impetus not to be repressed, accelerate their motion, and run before the unwilling mind. It is a frequent fault of the muscles belonging to speech, nor yet of these alone: I have seen one, who was able to run, but not to walk[8].” [Footnote 8: Est et ubi musculi, recte quidem ad voluntatis nutum in actum concitati, injussa dein agilitate atque impetu non reprimendo motus suos accelerant, mentemque invitam præcurrunt. Vitium loquelæ musculis frequens, nec his solis tamen proprium: vidi enim, qui currere, non gradi, poterat[A].] [Footnote A: Institution, Patholog. Medicinal. Auctore. H. D. Gaubio. 751.] Sauvages, referring to this symptom, says, another disease which has been very rarely seen by authors, appears to be referable to the same genus (Scelotyrbe, of which he makes _Chorea sancti viti_ the first species); which, he says, “I think cannot be more fitly named than hastening or hurrying Scelotyrbe (_Scelotyrbem festinantem, seu festiniam_).” _Scelotyrbe festinans_, he says, is a peculiar species of scelotyrbe, in which the patients, whilst wishing to walk in the ordinary mode, are forced to run, which has been seen by Carguet and by the illustrious Gaubius; a similar affection of the speech, when the tongue thus outruns the mind, is termed volubility. Mons. de Sauvages attributes this complaint to a want of flexibility in the muscular fibres. Hence, he supposes, that the patients make shorter steps, and strive with a more than common exertion or impetus to overcome the resistance; walking with a quick and hastened step, as if hurried along against their will. _Chorea Viti_, he says, attacks the youth of both sexes, but this disease only those advanced in years; and adds, that it has hitherto happened to him to have seen only two of these cases; and that he has nothing to offer respecting them, either in theory or practice[9]. [Footnote 9: Ad idem genus morbi altera species rarissima ab auctoribus prætervisa referenda videtur, quam non aptius nominari posse putem quàm scelotyrbem festinantem, seu festiniam.