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13. Of Snails and Leeches, and whether all Animals have blood.
WHether Snails have a row of small teeth, orderly placed in the Gums, and divided into several smaller and greater; or whether they have but one small bended hard bone, which serves them instead of teeth, to bite out pretty large and half-round bits of the leaves of trees to feed on, Experimental Philoso∣phers may enquire by the help of their Microscopes; My opinion is, That Snails are like Leeches, which will not onely bite, but suck; but this I do verily be∣lieve, that Snails onely bite Vegetables, not Animals, as Leeches do; and though Leeches bite into the skin, yet they do not take any part away, but suck onely out the juicy part, that is, the blood, and leave the grosser substance of flesh behind; and so do Snails bite into herbs, to suck out the juicy substance, or else there would be found flesh in Leeches, and herbs in Snails, which is not; so that Snails and Leeches bite for no end, but onely to make a passage to suck out the juicy parts; and therefore I cannot perceive that they have bones, but I conceive their teeth or parts they pierce withal, to be somewhat of the nature of stings, which are no more Bones then the points of Fire are; I do not certainly af∣firm they are stings, but my meaning is, that they are pointed or piercing figures, that is, as I said, of the nature