Note k — BOOK IV.

For the Structure of the Intercostals, Midriff, &c. I shall refer to Dr. Willis, and other Anatomists. Bur Dr. Drake taxeth Dr. Willis with an Error in fancying there is an Opposition in the Office of the Intercostals, by reason that the Fibres of the external and internal Intercostals decussate; that therefore the external serve to raise the Ribs, the internal to draw them down. But Dr. Drake is of Steno’s, and Dr. Mayow’s Opinion, that notwithstanding the Decussation of their Fibres, the Power they exert upon, and the Motion they effect in the Ribs, is one and the same. Drake’s Anat. l. 2. c. 7. and l. 4. c. 5. Mayow de Respir. c. 7.