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to difcover thefe oval particles at the time the blood was in its na- 

 tural courfe in the veins ; for which purpofe, I feledled for exami- 

 nation, the very fmalleft blood-veffels ; but though I was very atten- 

 tive, I could not fatisty myfelf, for fometimes I faw a darkifh parti- 

 cle, then one much more tranfparent ; and when I viewed the very 

 fmallell veflels, in which the blood had little or no motion, as 

 divers veflels at the extremity of the fins, the particles of the blood 

 lay fo very thin and fcattered, that I could not fee any thing ex- 

 cept a liquid without a motion, which was fomewhat of a yellow 

 colour. 



I have heretofore caufed drawings to be made of the particles of 

 blood, reprefenting them of an * oval fliape, though the limner had 

 not the originals before him. I have alfo dikited blood with water, 

 becaufe the multitude of its particles impeded a just view of them ; 

 but now, for the greater fatisfadlion of myfelf and others, I gave 

 into the hands of the limner a microfcope, before which was placed 

 a portion of the blood of a Salmon, in order that he might make a 

 drawing of the particles as they appeared to him. 



Fig. 20, AE CD, fliews the oval particles of the blood of a Sal- 

 mon, which weighed about thirty pounds. 



At A B are reprefented thofe particles which did not come in a 

 ftraight line before my eye ; the others, fliewn at C, floated llraight 

 before the fight : in mofl: of them was a luminous fpot, though in 

 fome larger than in others ; thefe the limner alfo obferved, and 

 reprefented them as nearly as he could in the middle of the parti- 

 cles in the drawing. Thefe particles appeared black, and I dilpofed 

 the ferum in which they floated, in fuch a manner as to make 

 them fink to the bottom, though with fome difficulty ; and in this 

 pofition the limner had an opportunity of feeing fome thoufands of 

 thofe particles. 



* See Vol I. p. 9-1. 



