Note e — BOOK IV.

The Variation of the Wind-pipe is observable in every Creature, according as it is necessary for that of the Voice. In an Urchin, which hath a very small Voice, ’tis hardly more than membranous. And in a Pigeon, which hath a low and soft Note, ’tis partly cartilaginous, and partly membranous. In an Owl, which hath a good audible Note, ’tis more cartilaginous; but that of a Jay, hath hard Bones instead of Cartilages; and so of a Linnet: Whereby they have both of them a louder and stronger Note, &c.

The Rings of the Wind-pipe are fitted for the Modulation of the Voice: For in Dogs and Cats, which in the Expression of divers Passions use a great many Notes, (as Men do,) they are open and flexible, as in Man. Whereby all, or any of them are dilated, or contracted, more or less, as is convenient for a higher or deeper Note, &c. whereas in some other Animals, as in the Japan-Peacock, which useth hardly more than one single Note, they are entire, &c. Grew’s Cosmolog. Sacr. Book I. Chap. 5. §. 9, 10.