( 3)3 ) 



exceeded the fize of a common grain of fand. But whether this 

 fmall quantity of air came out of the blood, or was air in the water 

 with which I had wafhed out the tube, before I put the fecond poT- 

 tion of blood into it, I cannot determine. 



I then gave directions that the glafs veiTel in which the blood 

 had been taken, fliould be brought to my houfe, and after it had 

 Hood an hour, and the blood was yet warm, I poured fome of 

 that which was towards the furface and was now grown a little 

 thinner, into the glafs tube, and having flopped the orifice at D, 

 I again repeated my operation of pumping, and I found that the 

 air produced by drawing out the pillon, occupied a fpace in the 

 tube from C towards B, of almoft four inches, and, from the moft 

 exadl obfervation I could make, I found that the air in the fmall 

 tube was augmented only about ,i^T part of the quantity of 

 blood. I then left the glafs tube with the pifton extraded, and 

 the orifice at D Hopped, for fix hours, at the end of which time, I 

 faw that the lafl produced quantity of air was diminiflied more 

 than half. 



After the blood had remained eight hours after taken from the 

 animal, and there was a quantity of ferum colledted on the furface, 

 I employed myfelf to extradl the air from it. But becaufe there 

 w-ere eight or ten air bubbles in the fmall tube among the blood, 

 I could not make fo exa6l a computation as before, but from the 

 infpedlion of my naked eye, I thought that there was rather a 

 greater quantity of air iflued from the blood. 



When this blood had fl:ood in the glafs twenty-fix hours, I took 

 fome of the ferum off it, which I put into the glafs tube and drew 

 off the fubtile air, which appeared in many minute air bubbles 

 rifing out of the blood, and I found the tube from C towards B, 

 filled with air to the height of three inches and three quarters, and 

 drawing out the pifton as carefully as I could, I thought the air pro- 

 duced was yh- part of the blood. 



Vol. II. R r 



