442 DISEASES CLASS IV. 3* 3. i, 



ORDO III. 



Retrograde Affociate Motions. 



GENUS III. 



Catenated with Voluntary Motions. 

 SPECIES. 



1. Rwninatio. In the rumination of horned cattle the food i 

 brought up from the firft ftomach by the retrograde motions of 

 the ftomach and cefophagus, which are catenated with the vol- 

 untary motions of the abdominal mufcles. 



2. Vomitio 'uoluntana. Voluntary vomiting. Some human 

 fubjects have been faid to have obtained this power of volunta- 

 ry action over the retrograde motions of the ftomach and cefoph- 

 agus, and thus to have been able to empty their ftomach at 

 pleafure. See Sect. XXV. 6. This voluntary act of empty- 

 ing the ftomach is poflefled by fome birds, as the pigeon ; who 

 has an organ for fecreting milk in its ftomach, as Mr. Hunter 

 obferved j and foftens the food for its young by previoufly fwal- 

 lowing it ; and afterwards putting its bill into theirs returns it 

 into their mouths. See Sect. XXXIX. 4. 8. The pelicans ufe 

 a ftomach, or throat bag, for the purpofe of bringing the fifli, 

 which they catch in the fea to (hore, and then eject them, and 

 eat them at their leifure. See Sect. XVI. 1 1. And I am well 

 informed of a bitch, who having puppies in a ftable at a diftance 

 from the houfe, fwallowed the flem-meat, which was given her, 

 in large pieces, and carrying it immediately to her whelps, 

 brought it up out of her ftomach, and laid it down before them. 



3. Eruflatio voluntaria. Voluntary eructation. Some, who 

 have weak digeftions, and thence have frequently been induced 

 to eruct the quantity of air difcharged from the fermenting ali- 

 ment in their ftomachs, have gradually obtained a power of vol- 

 untary eructation, and have been able thus to bring up hogf- 

 heads of air from their ftomachs whenever they pleafed. This 

 great quantity of air is to be afcribed to the increate of the fer- 

 mentation of the aliment by drawing off the gas as foon as it i 

 produced. See Sea. XXIII. 4. 



ORDO 





