ages 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
praecurrunt. Vitium loquelae 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 ha