( 104 ) 



At length all the blood from P to R, was fo far rendered fluid, that, 

 at every pulfation, it was driven forward, and tlien returned back 

 again. In thefe obfervations, about two minutes of time elapfcd, 

 and my eye being fatigued, I took it off the object to give it reft, in 

 which interval, the animal put itfelf into a violent agitation, there- 

 by precluding any farther obfervation. 



But, fince we now clearly fee, that coagulated blood can, by the 

 pulfation of the heart, in courfe of time, not only be put in motion, 

 but alfo fo far diffolved, that its component particles or globules may 

 re-afiume their prifline figure, we may fairly conclude, that blood, 

 in any animal, which by a blow or bruife, is made to coagulate and 

 ftagnate in the vefl'els, may, in the fpace of fome days, be reltored 

 to motion, 



60 For, fuppofms:, that in an hu- 



man body, the blood is driven 



4500 an hour. f^.^^^ ^j^^ j^^^^^. feventy-five times 



in the fpace of a minute ( fome fay 



18000 ' \ J 



90 the number of pulfation s does not 



108,000 a day anJ a night. exceed fixty, but I belie\'e my 



[f computation to be neareft the 



i,o8c,ooo ten days. truth) it follows, that the pulfa- 



tions in an hour's time, are 4,500, 

 and, in the fpace of a day and a night, 108,000. 



Now, if we find, that the appearance produced by coagulated blood, 

 will, in the fpace of ten days diHippear, from our bodies, and confi- 

 der, that, in the fame fpace of time, a million and eighty tiioufand 

 pul Cations are performed, and fuppofing, that, at every pulfation, fo 

 much of the blood is put in motion in the feveral veflels, as is only 

 equal in fize to a grain of fand, we may gather how much of flag- 

 nant blood may be reftored to motion, in the fpace of time juft men- 

 tioned. 



