( 125 ) 



and this is ftill more increafed by hard manual labour, which in- 

 creafes the colled:ion and cohefion of particles. 



After this I examined the outward Ikin of my mouth, particu- 

 larly my under-lip, and found this to be alfo covered with Scales, 

 but fomewhat larger, broader, and thinner than thofe of the reft 

 of our bodies. Fig. 12, is a Scale of this defcription, being one 

 of the moll perfect I met with ; thefe Scales were alfo covered 

 with a greater number of ftreaks ; produced, as I fuppofe, in the 

 manner I have mentioned above ; and Hkewife with many very 

 tranfparent globules, which are pictured in the figure. Another 

 ot thefe Scales, adjoining to the former, was of the Ihape repre- 

 fented at fig. 13. But thefe Scales were not placed as they are 

 on other parts of our bodies, that is, three at leaft on each other, 

 which is the reafon that our Ikins appear white, (for all tranfpa- 

 rent particles, if laid loofe on each other, exhibit that colour ; fuch 

 as paper, froth, fpittle, poimded glafs, fnow, and the like) ; but, 

 on the contrary, the Scales on the lips, as far as I have been able 

 to difcover, only cover each other lightly on the edges, fo that the 

 flefh and the rednefs of the blood are feen through the greateft part 

 of each Scale, and for this reafon the inlide of the lips and mouth 

 are red. 



After this, being defirous to inveftigate the manner of the for- 

 mation of the Scales on our bodies, I judged that thefe laft men- 

 tioned Scales, taken from the lips, would be the fittell: for that 

 j^urpofe, becaufe they are more eafily feparated from the Ikin be- 

 fore they become dried, than on the other parts of the body. 

 And, after repeated obfervations, I faw that almoft all of them 

 had in the middle a bright fpot, riling above the reft of the Scale; 

 which fpot I had formerly thought was caufed by accident ; and 

 from hence I now concluded for a certainty, that not only the Scales 

 on our lips, but alfo on our whole bodies, are formed, in like manner 

 as the Scales of fifties, of veflels, by which they are increafed in. 



