144 DISEASES CLASS I. 3. 3. r. 



ORDO III. 



Retrograde Irritative Motions* 



GENUS III. 



Of the Sanguiferous Syjtem, 



SPECIES. 



I. Capillanum mctus retrogreffus* In micrbfcopicr experi- 

 ments it is ufual to fee gfobules of blood regurgitate from the ca- 

 pillary veflels again and again, before they pafs through them 9 

 and not only the mouths of the veins, which arife from thefc ca- 

 pillaries, are frequently feen by microfcopes to regurgitate fome 

 particles of blood during the ftruggles of the animal ; but a re- 

 trograde motion of the blood in the veins of thefe animals, from 

 the very heart to the extremities of the limbs, is obfervable by 

 Intervals during the diftrefles of the dying creature. Haller, 

 Elem. Phyf. T. i. p. 216. See Sedion XXIX. 3. 8. 



2. Palpitatio cordis. May not the ineffectual and weak une- 

 qual motions of the heart in hyfteric cafes be afcribed to the re- 

 trograde motions of it, which continue for a fliort time, or ter- 

 minate in fyncope ? See Clafs IV. 3. i. 6. 



3. Anhelatwfpafmodica. In fome afthmas may not the difficul- 

 ty of refpiration arife from the inverted action of the finer branch- 

 es of the bronchia, or of the pulmonary artery or vein, like thofc 

 of the capillaries above defcribed in No. i. of this genus ? 





