And here, before I attempt to demonstrate how Exercise proves so beneficial in some few Cases, it may not be amiss to premise briefly some of the ways Nature takes to relieve her self, when in danger of being oppress’d, which may serve to illustrate my following Discourse; as likewise some Instances of the Efforts of Nature, caus’d by external Application, or at least by such Internals as cannot be suppos’d to be Cordial or Vinous, or to be assimilated with the Blood and Animal Spirits. _First_, then; We may observe how Nature acquits her self of what we commonly call a Cold, wherein a considerable quantity of the _Materia perspirabilis_ is detain’d, by a sudden Constriction of the Pores of the Skin, we shall find, that after some time the saline Particles growing turgid, vellicate some Fibres of the fifth Pair of Nerves dispers’d about the Nose, which by consent draw the Diaphragm into a Convulsive Motion, by which the Air is press’d out of the Lungs thro’ the Nose with some Violence; and by the shock the Glands of those Parts are open’d, and the Humour, which was detain’d, is let out. This is _Sneezing_; to which frequently is join’d _Gauping_ or _Retching_, another Method of Nature to shake off a Load that she finds growing upon her; this is more often repeated than _Sneezing_, and may be conceiv’d to dilate some internal Parts by those Stretchings out of the Limbs, and more plentiful Inspiration; _Sanctorius_ tells us in the 31st _Aphorism_ of his _fourth_ Section, that, _Corpora Oscitatione & Pandiculatione horæ dimidiæ spatio magis perspirant, quàm tribus horis alterius temporis_, and compares it to a Cock’s clapping his Wings after his Rest; so that it is manifest, that even in that vulgar Affect there is an Alteration caused in the Body, that is not Contemptible. To these may be added the _Singultus_ or Hiccough, by which the Ventricle, when too full, endeavours to relieve her self, either by throwing off some of the rarifi’d Contents by the Gullet, or perhaps by the _Pylorus_. _Lastly_, Let us consider how _Laughter_ affects us, and it will appear, that this Contrivance of Nature, wherein the Body does sympathize with the Mind, proves so beneficial, by the playing of the Muscles of the _Thorax_, and the pressing out of the saline Particles, so frequently and sensibly as it does in some chearful People, to whom it is more habitual than others, insomuch that it comes to be Proverbially, a Cause of Fatness. All these Instances shew, that Nature seems to receive more Relief from the Compression or acting of the containing Parts strictly taken, than most Men easily imagine.