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Of Convulsive Diseases.
CHAPTER I. Of Spasms or Convulsive Motions in Generall.
IN handling the Convulsive Distempers, many Physitians distinguish between the Spasme or Convulsion, and Convulsive Motion; by the first they understand a constant Contraction, whereby the member becomes stiff and inflexible; by the Second, swift motions, and Concussions, which, coming between, cease, and return alternatly: 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 designe a certain Spasmodick or Convulsive Affection; wherefore to distinguish it better, we will call the for∣mer distemper with Cardan, tetanon, a continual Convulsive Cramp, but the o∣ther Spasm, or, a Convulsive motion in generall.
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 regular motive function, is effected in an animated Body: but the more full Consideration of this, because it belongs to the Physiologie, or Reason∣ing 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 animal Spirits are the next In∣strument * 1.1 of regular motion, and that their Action, or moving force, consists only, in that they being more thickly heaped up together, in the motive part, and there spreading themselves in a more large space, they blow it up, and in∣tumefie 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 Nerves already published, * 1.2 we have shown this kind of motion to be twofold, to wit, Spontaneous, and meerly natural, the Instinct 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 o∣ther motive parts of the Parenchyma, or Inwards; 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 swift Commerce, between the animal Spirits, which Constitute the Hypostasis of the sensitive Soul, within the foresaid parts, disposed, or fitted by a continued Series. But there is this notable difference be∣tween * 1.3 the motion of a muscle, and that performed by other parts; for in these, the action is most often circumserib'd within the bounds of the motive body, so as its membranes only, or one part of the inward moves another, and conse∣quently 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 (al∣though within some musculous part, as the Heart and Diaphragma, they proper∣ly 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 where∣ever it is begun, the Spirits there more thickly gather together, and Spreading themselves forth, they first intumifie this part, then going forward 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