206 CIRCULATORY Sect. XXIII. i. u 



SECT. XXIII. 



OF THE CIRCULATORY SYSTEM. 



J. *The heart and arteries have no ani eles. Veins ahfcrh 



the bl *el it forwards, and &jl end the heart ; contraction of 



?s. Vena portarum. II. Qlanqj which 

 om the blood. With long necks, with jhort necks. 

 III. Abhrbent fyftem. IV. Heat given oiit fr-om glandular fe- 

 cretions. J es colour in the lungs ana in the glands and 



en rj, V. Blood is abforbedby veins , as chyle by lacteal vejfels^ 



other --wife they could not join their jlr earns. VI. Tivo hinds of Jlim- 

 ulus, agreeable and difagreeable. Glandular appetency. Glands 

 c riyinaliy pojfejfed [enfation* 



I. I. We now ftep forwards to illuftratefome of the phenom- 

 ena of difeafes, and to trace out their moft efficacious methods 

 of cure ; and mail commence the fubjecl with a ihort defcrip- 

 lion of the circulatory fyfttm. 



As the nerves, whofe extremities form our various organs of 

 fenic and mufcles, are all joined, or communicate, by means of 

 brain, for the convenience perhaps of the diitribu: ion of a fub- 

 tile ethereal fluid for the purpofe of motion ; fo all thofe veilW 

 of the , « hich carry the proffer fluids for the purpofes of nu- 



trition, communicate with each other by the heart. 



The heart and arteries are hollow mufcles, and are therefore 

 indued with power of contraction in confequence of ftimulus, 

 3ik-e all other mufcular fibres ; but, as they have no antagonist 

 mufcles, the cavities of the veffels, which they form, would re- 

 main for ever clofed, after they have contracted themfelves, un 

 lefs fome extraneous power be applied to again diilend th 

 This extraneous power in refpect to the heart is the current o 

 blood which is itually abforbed by the veins from the variou 



glands and capillaries, an i pufbed into the heart by a power prob- 

 ably very Gmilar to that, which raifes the fap in vegetables i 

 g, which, according to Dr. Hale's experiment on th 

 {lump of a vine, exerted a force equal to a column of wate 

 above twenty feet high. This force of the current of blood i 

 the veins is partly produced by their abforbent, power, exert- 

 *_ at tin ming of every fine ramification ; which may b 



conceived to be a n as the mouths of th 



la&eals and lymphatics abforb chyle and lymph. And parti 

 lifted compreffionby the pulfations of their gener 

 at arteries ; by which the blood is perpetually pro- 

 pelled 



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