Part If. in tha Creation. 275 



cians, both ancient (as Galen) and modern, were 

 of opinion that the Pulfe of the Arteries was ow- 

 ing to their Coats; tho' the firft that I know of 

 who obferv'd the third Coat of an Artery to be a 

 mufcular Body, composed of annular Fibres, was 

 Dn Willis. This mention of the periftaltick 

 Motion puts me in mind of an ocular Demon- 

 ftration of it in the Gullet of Kine when they 

 cbew the Cud, which I have often beheld with 

 Pleafure ; for after they have fwallow'd one 

 Morfel, if you look ftedfaftly upon their Throat 

 you will foon fee another afcend, and run pretty 

 fwiftly all along the Throat up to the Mouth, 

 which it could not do, unlefs it were impell'd by 

 the fucceffive Contradion or periftaltick Mo- 

 tion of the Gullet continually following ; and it 

 is remarkable that thefe ruminant Creatures have 

 a Power by the Imperium of their Wills of dire- 

 (fting this periftaltick Motion upwards or down- 

 wards. I fhall add no more concerning the 

 Heart, but that it and the Brain do mutuus operas 

 tradere^ enable one another to work ; for, firfi^ 

 the Brain cannot itfelf live unlefs it receive con- 

 tinual Supplies of Blood from the He:irr, but lefs 

 can it perform its Fundlions, of preparing and 

 diftributing the animal Spirits, nor the Heart 

 Pulfe, unlefs it receives Spirits or fomething elfe 

 that defcends from the Brain by the Nerves \ for 

 do but cut afunder the Nerves that go from the 

 Brain to the Heart, the Motion thereof, in moft 

 perfed: and hot Creatures, ceafeth immediately. 

 Which Part began this Round is the Queftion. 



T 2 ^ I find 



