( 210 ) 



I hare before faid, that I believed every globule in our blood, 

 I mean thofe, fix of which go to make up a perfect globule, as is 

 iliewn in Jig. 30, is itlelf eompofed of fix globules, and who 

 knows how this is performed ? For in how fmall parts foever we, 

 in imagination, divide a globule of blood, there may, neverthclefs, 

 be particles of which fuch a globule confills, infinitely fmaller, and 

 I w^onder that any will be fo bold as to publilh what they do, rc- 

 fped:ing the original particles of matter ; for my part, I think, that 

 could I divide, even in imagination, a globule of blood into a thou- 

 fand million of fmaller particles,* 1 fliould not go the extent of its 

 component parts. 



Since we now fee, as before is obferved, that the particles of 

 blood can, by preflure, be divided, and fo united with the thin li- 

 quor in which they float, that we take it for a fimple or uncom- 

 pounded liquid, we may imagine, than when a horl'e prell'es his 

 breall with a heavy load, the globules of blood in the veU'els, where 

 the prelTure is greatell, may be dillblved or divided in the velTels, 

 and united with the fluid, which phyficians call the ferum. 



I have alfo thought, whether or no the particles of blood, fo di- 

 vided or diflblved, may not, when removed from the incumbent 

 preflure, afliime their prilHne figure, in like manner with the parti- 

 cles of fat or tallow ; for, if a portion of ox's or fheep's tallow is 

 expofed to the fire, the particles of fat, which we call globules, as 

 having the neareft refemblance to that fliape, are diflblved and ex- 

 hibit only a clear tranfjjarent liquid, even to the microfcope, but 

 "when the heat ceafes it again appears in the fliape of globules, and 

 if melted ten times over it ftill, when cold, aflumes the fliape of 

 fpherical particles. 



I have likewife laid it down, as my opinion, that no blood, Mdiich 

 is carried in a vein to the heart, can become arterial blood, unlefs 



* The Latin tranflation has i( decern millics^ tea thoufand : but the author's own words 

 are, dinifent millioenen^ a thoufand millions. 



