in his search, till at last he found the Heart, which when he saw closed with a very strong Cover, and fastned with strong Ligaments, and covered by the Lungs on that side which he had open’d; he began to say to himself.  “If this part be so on the other side as it is on this which I have open’d, then ’tis certainly in the midst, and without doubt the same I look for; especially considering the Conveniency of the Situation, the Comliness and Regularity of its Figure, the Firmness and Solidity of the Flesh, and besides, its being guarded with such a Membrane as I have not observ’d in any part.”  Upon this he searches the other side, and finding the same Membrane on the inside of the Ribs, and the Lungs in the same posture, which he had observ’d on that side which he had open’d first, he concluded the Heart to be the part which he look’d for.

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[Illustration 4]

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Sec. 21.  Therefore he first Attacks the Pericardium, which, after a long tryal and a great deal of pains, he made shift to tear; and when he had laid the Heart bare, and perceiv’d that it was solid on every side, he began to examin it, to see if he could find any hurt in it; but finding none, he squeez’d it with his Hands, and perceiv’d that it was hollow.  He began than to think that what he look’d for, might possibly be contain’d in that Cavity.  When he came to open it, he found in it two Cavities, one on the right side, the other on the left.  That on the right side was full of clotted Blood, that on the left quite empty.  “Then (says he,) without all doubt, one of those two Cavites must needs be the Receptacle of what I I look for; as for that on this side there’s nothing in it but congealed Blood, which was not so, be sure, till the whole Body was in that condition in. which it now is” (for he had observ’d that all Blood congeals when it flows from the Body, and that this Blood did not differ in the least from any other,) “and therefore what I look for, cannot by any means, be such a matter as this; for that which I mean, is something which is peculiar to this place, which I find I could not subsist without, so much as the Twinkling of an Eye.  And this is that which I look’d for at first.  For as for this Blood, how often have I lost a great deal of it in my Skirmishes with the Wild Beasts, and yet it never did me any considerable harm, nor rendred me incapable of performing any Action of Life, and therefore what I look for is not in this Cavity.  Now as for the Cavity on the left side, I find ’tis altogether empty, and I have no reason in the World to think that it was made in vain, because I find every part appointed for such and such particular Functions.  How then can this Ventricle of the Heart, which I see is of so excellent a Frame, serve for no use at all?  I cannot think but that the same thing which I am in search of, once dwelt here, but has now deserted his Habitation and left