IMPROVED. 



it is always increafed in another, or elfe a Diftem- 

 per will enfue ; for which Reafon, when the Cold- 

 nefs of the external Air (which more immediately 

 aftl'ds the outer-Skin) leiTens the Injenftlle Perffi- 

 ration that Way, either the fenfible Evacuations 

 are increafed, as commonly the Urine ; or elfe 

 greater Quantities are carried off by Refpiratioii 

 from the Lungs and Parts about the Mouth ; or, 

 lailly, perfpired into the Cavities of the Guts ; 

 which afterwards are difcharged by breaking Wind 

 either upwards or downwards : For, as long as the 

 Impulfe within rem.ains the fame, wherever there 

 is the leaft Refillance, thither will always the great- 

 eft Derivation of perfpirable Matter be. And from 

 hence it is that we fo frequ ntly find ( v/hen the 

 Body is more than ufually expoi'ed to external Cold,) 

 Gripings, and great UneafmefTes in the Bowels, 

 which proceed from nothing elfe but becaufe fome 

 Part of the perfpirable Matter, that ought to have 

 pafs'd the outer Skin, finding an opener PaiTage 

 within is thrown off that Way. And to this Pur- 

 pofe it is likewife very obfervable in Dogs, whofe 

 outer Skin is very little porous, ^i'z. in hot Seafons, 

 and upon much Exercife, whereby the more than 

 ordinary Motions of the Body occafion greater At- 

 tritions or Frettings off, of their circulating Fluids, 

 which produce larger Quantities of perfpirable Mat- 

 ter, that thefe Creatures throvv^ off a vail deal from 

 their Lungs in Refpiration and the Parts about the 

 Mouth, infomuch that their very Breath appears 

 like thick Smoke. 



Le^venhoeck pretends by the Help of his Glaffes, 

 (though we have better now than ever he had. 

 Thanks to the Incomparable Sir Ifaac Nenvton for 

 the Improvements ; ) f fay, this nice Difcoverer 

 Ihews the Texture of the Cuticula or outward Skin 

 to be Scaly, and that thofe Scales cover one another 

 in feveral Lamina or Plates, more or lefs according 

 to the different Thickneffes of the Scarf-skin in the 

 feveral Parts of the Body ; and in the Compafs of 



one 



