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alio perceived the arteries to be uncommonly large, which I con- 

 ceived to proceed only from this, that the circulation being impeded, 

 they vs^ere by the impulfe of the blood diftended to that lize. 



Upon viewing the fin ftill nearer to the tail I fav^^ the blood run- 

 ning both in the arteries and veins, and what teemed to me very 

 worthy of note was this : I favv the blood llagnating in an artery, 

 fliewn in p'g. 1 0, at O F Q, from P to Q, and fo on towards the 

 extremity of the tail, and in the fame artery from P to O, and alfo 

 towards the fifli's body, the blood was carried in its ufual motion, 

 namely, from O towards P. From this artery there arole a branch, 

 reprefented at P, in which the arterial blood, after it had been driven 

 thus far, was carried back towards the heart, fo that this branch, 

 PV, arifmg out of the artery, OPQ, muft be called a vein. 



At about three hairs breadth from the before mentioned artery, 

 there was another artery, nearl}^ of the fame fize, which is Ihewn in 

 the figure, at R S T. In this the blood between S and T, and alfo 

 beyond it, was coagulated, and the blood which, from R to S, was 

 driven forward, iflued into a branch arifing out of that artery, at S, 

 which alfo led back towards the heart, as is lliewn in S V ; \\ here, 

 at V, both the veins, P V and S V, are joined, and conllitute a larger 

 vein, VW. 



Moreover, I took a Carp, in order to view the circulation, but it 

 was fo reftlefs that, after many trials, I determined to wrap it in a 

 cloth, in order to view the fin on its back, which, being nearer to 

 the heart, I judged the circulation might be llronger : and here 1 faw 

 the blood moving in an artery, which divided itfelf into two other 

 arteries, fo fmall as orily to admit a fingle globule or particle of 

 blood at a time ; one of thefe minute arteries was joined to a Acin, fo 

 large that the blood in it began to aflume a red colour, the other I 

 could not follow with my eye, becaufe its courfe was hid behind a 

 fmall bone in the fin. Fig. 17, AB, is this fmall artery, which, at 

 B, was divided into two branches, one of which, B C, was joined 

 to the vein D C E, at C ; fo that the blood whichj in the artery, was 



