( 2^4.) 



it longitudinally, tlicre appeared Ibmc diiTerence in the formation, 

 for, whereas the cavity in the hearts of oxen and fheep, is provided 

 v*ith a tendon ; on the contrary, liere, inl^ead of the tendon, I 

 found various flefliy parts, with their ramifications, fpread over the 

 cavity of it. Whereupon, I began to refle6l on the great exertion, 

 wliich birds are obliged to ufe in flying, and how little they are fati- 

 gued, even after taking a long fliglit. But, to fay any thing fatisfac- 

 torily on this head, many previous obfervations ouglit to made. 



Afterwards, I examined the heart of a cod fifh, and found its com- 

 ponent parts linked together in the lame manner as I have defcribed 

 thole of the other animals, and of the duck, to be : but when I re- 

 fle6led on the circulation of the blood through this heart, (which ap- 

 peared more of a flelliy than a fifliy nature) and confidered, how the 

 blood is propelled from it, into a white body, in folidity or denfity 

 nearly equal to the heart, whofe ])articles are linked together in the 

 manner I have defcribed, and to how great a degree thefe particles 

 upon the infufion of the blood muft be extended, and how contracJkd 

 in its propulfion, I was more and more loft in admiration. 





