144 DISEASES CLASS 1. 3. 3. 1. 



ORDO III. 



Retrograde Irritative Motions. 



GENUS III. 



Of the Sanguiferous System. 

 SPECIES. 



1. Capillarium motus retrogressus. In microscopic experi- 

 ments it is usual to see globules of blood regurgitate from the 

 capillary vessels again and again, before they pass through ihem; 

 and not only the mouths of the veins, which arise from these ca- 

 pillaries, are frequently seen by microscopes to regurgitate some 

 particles of blood during the struggles of the animal; but a retro- 

 grade motion of the blood in the veir.s of these animals, from 

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

 intervals during the distresses of the dung creature. Haller, 

 Elem. Phys. T.I. p. 216. See SectioiTXXIX. 3. 8. 



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

 qual motions of the heart in hysteric cases be ascribed to the re- 

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

 minate in syncope? See Class IV. 3 1.6. 



3. Jlnhelatio spasmodica. In some asthmas may not the difficulty 

 of respiration arise from the inverted action of the finer branches 

 of the bronchia, or of the pulmonary artery or vein, like those of 

 the capillaries above described in No. 1. of this genus? 



