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Of Convulsive Diseases.
CHAPTER I. Of Spasms or Convulsive Motions in General.
IN handling the Convulsive Distempers, many Physitians distinguish between the Spasme or Convulsion, and Convulsive Motion; by the first they understand a con∣stant Contraction, whereby the Member becomes stiff and inflexible; by the Second, swist motions, and Concussions; which, coming between, cease, and return alternaetly: But neither those who have observed these notes of difference, nor other Authors, have taken notice that they are continual: for that by the words Spasme, and Convulsion, they often design a certain Spasmodick or Convulsive Affection; wherefore to distinguish it better, we will call the former distemper with Cardan, Teta∣non, a continual Convulsive Cramp; but the other Spasme, or a Convalsive motion in general.
But that the irregular Nature and Causes of Convulsive motion, might more rightly have been made known, it should first have been declared, after what manner the regu∣lar motive function is effected in an animated body: but the more full Consideration of this, because it belongs to the Physiologie, or Reasoning of the Nature of the Brain, and Nervous stock, it is deferred to another Discourse: For the present, we will signifie in a word, as much as shall serve for the elucidation of the matter proposed. That the * 1.1 animal Spirits are the next instrument of regular motion, and that their Action, or mo∣ving force, consists only, in that they being more thickly heaped up together, in the mo∣tive part, and there spreading themselves in a more large space, they blow it up, and in∣tumefie * 1.2 it; which for that reason, being contracted, as to its length, draws to it self the part hanging to it. In our description of the N•…•…ves already published, we have shown this kind of motion to be twofold, to wit, Spontaneous, and meerly natural, the In∣stinct of this is derived from the Cerebel, but of that from the brain, but both through the pipes of the Nerves, as it were the channels, both to the muscles, and also to the fibres, interwoven with the membrains, and other motive parts of the Parenchyma, or in∣wards; Lastly, in all these, the various actions are so expeditiously effected, which either natural necessity, or the rule of the will requires, by that only means, that there is an intimate Conjunction, and communication of Duty, and most swist Commerce, be∣tween the animal Spirits, which constitute the Hypostasts of the sensitive Soul, within the foresaid parts, disposed, or fitted by a continued Series. But there is this notable diffe∣rence between the motion of a muscle, and that performed by other parts; for in these * 1.3 the action is most often circumscribed within the bounds of the motive body, so as its membranes only, or one part of the inward moves another, and consequently this is moved of its neighbour: But in the musculous stock, usually the moving part is placed in one member, and to be moved of another next it (although within some musculous part, as the Heart and Diaphragma, they properly for the most part move themselves only) hence the Membranes and inwards, are said to have as it were an intestine and vermicular Motion; such as whereever it is begun, the Spirits there more thickly gather together, and spreading themselves forth, they first intumifie this part, then going for∣ward another, and so farther, till at last they draw the hindermost parts, and by this means transfer an intumifaction, and therefore a motion, from one place to another; almost after the same manner as worms, and other creeping creatures make their pro∣gression. But to this motive function of the Membranes and Inwards, if it be frequent or undiscontinued, plenty of spirits are required, which notwithstanding execute their task calmly enough, without tumult or great force: And indeed it is to be observed, that the Animal Spirits flow not more sparingly into the Membraneous Inwards, than into the Muscles; as it appears from the more exquisite sense of those parts, and by the manifold insertion of Nerves within them, and the diversity of divarication, through the foldings and fibres, altho in the mean time the muscles are watered with a more plentiful influx of Blood: But as to the motion, performed in the musculous stock, the heaping together, and rarefaction of the Spirits, through the whole jointing of the mo∣tive