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 the more reasonable, it is held, that those Animals are taken into the Brain when they are very young, and much about the Size of a pretty big Ray of Light, which, by the By, is a Reason why a Man does not become a great Critick of a sudden, but daily improves, as those Animals grow up, and come to a worse Use of their Faculties. The Manner of their getting into the Brain is by Attraction through the Eyes; for when the Brain is heated by intense Thinking, it is allow'd to attract more strongly than when it is cool. This Opportunity is taken hold of for their Entry along with the Rays of Light through the Coats and Humours of the Eye, till they strike upon the Optick Nerve; in which there are insensible Holes for the Passage of the Animal Spirits, through which they are attracted into the Substance of the Brain. Those little Animals wander for some Time in the Substance of the Brain, till they come to the pineal Gland, to which they are invited by its pleasant Situation. It is to no Purpose to object, that if they were attracted through the Eyes in this Manner, they might blind a Man, since the same Objection lies against the Rays of Light; or to say, that they would eat the Brain, for lack of other Food, since it is more probable that they would rather chuse to eat one another than the Brain, whose Taste is quite different from that of Paper, and that it is reasonable to suppose that their Bodies are of a Taste not unlike it, as many nice Palates have assured us, since they were first bred in Ink and Paper. Besides, they are known to breed so fast, that two are sufficient to flock a Kingdom in a short Time, provided they be Male and Female.