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Now as Linnaeus practically applied the idea of species with a sagacity which has never been surpassed and rarely equaled and indeed may be said to have fixed its received meaning in natural history, it may well be inferred that in the phrase above cited he did not so much undertake to frame a logical definition, as to set forth the idea which, in his opinion, lay at the foundation of species; on which basis A.L. Jussieu did construct a logical definition "Nunc rectius definitur perennis individuorum similium successio continuata generatione renascentium."

Quo major est virorum præstantium, tui similium inopia; eo mihi charior est, & esse debet & amicitia tua: quam quidem omnibus officiis, & studiis, quæ a summa benevolentia possunt, perpetuò colam: However, who study the curiosities before-named, if they are not very well versed in astrology, they shall rarely attain their desired ends.

The best writers do not often use the neuter adjective as noun in the oblique cases unless there is something in the context to show the gender clearly, as in 24 aliis ... eis quae; we have, however, below in 8, isto = ista re; 72, reliquum; 77, caelestium = rerum caelestium; and in 78, praeteritorum futurorumque; see other instances in n. on Lael. 50 similium.

And yet no naturalist can be certain that, because they exhibit similarly marked characteristics, the one ever descended from the other; for the universal experience-rule still holds good that "like engenders like," and we search in vain for anything more than a similarity of idea, or logical connection, which justifies a recognition of the individuorum similium in Jessieu's definition of species.