( 98 ) 



broken, and, that, what in the animal, when ahve, was a thin fluid, 



might become folid in the veflels when cold, and exhibit the appear- 



iUice of thofe globules. I alfo faw, dilperled among them, fome 



other bright irregular globules of different lizes, and fome as large 



as a globule of human blood, and others larger. Among, or in the 



midft of this watery matter and globules, there were difperfeda 



great number ot wonderfully minute blood-veffels, and these in no 



greater a portion of Brain than the fize of a large grain of fand. 



Many of thefe blood- veflels were fo minute that (to judge by the 



eye) if one of the red globules in the blood of a Turkey > or other 



bird, were to be divided into five hundred parts, not one of thele 



parts could be contained in the cavity of thofe veflels. For I judged, 



that if the fize of the cavity of thofe veflels fliould be confldered 



as 1, the axis of one of thofe globules mull be as 8, and confe- 



8 quently, if the axis of any fphere is 1, and the axis of ano- 



^ ther is 8, then the proportion will be as 1 to 512; and though 



C4 thefe blood-velFels were fo minute, yet their colour plainly 



^ fliewed that the fubflance they contained was what gives the 



ii2 blojKl its red colour. And, if I had not taken notice of the 



— ' faint colour w hicl) a globule of blood, tingly taken, exhibits, 



it would have been impoflible for me to know thefe to be bloods 



veflels, and thus it appears that the reddifli liquid imparts to them 



fome kind of colour ; this I was the more certain of, by obferving 



fome of thofe vefl^els Ibmevvhat larger which aflluned a redder call. 



Thefe very minute blood-veflels appeared of a deeper colour \^ here 



three or four of them lay one on another, without any interjacent 



fublhince. From thefe appearances, I was more firmly of opinion 



than before, that the globules of blood, whence its rednefs proceeds, 



are divided into fmaller parts, when they come to fuch minute vel- 



fels as they cannot enter without being divided ; and I was now of 



opinion, that the dark colour of that part of the Brain, called the 



corticle, in which it differs from the white part, called the nicdul- 



