A critical and experimental essay on the circulation of the blood; especially as observed in the minute and capillary vessels of the batrachia and of fishes / By Marshall Hall.

  • Hall, Marshall, 1790-1857.
Date:
1831
Catalogue details

Licence: Public Domain Mark

Credit: A critical and experimental essay on the circulation of the blood; especially as observed in the minute and capillary vessels of the batrachia and of fishes / By Marshall Hall. Source: Wellcome Collection.

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    A BRIEF ACCOUNT OF THE SINGULAR PHENO- MENON OF A CAUDAL HEART IN THE EEL. Ir is well known to the comparative anatomist, that the fish tribe possess only a simple pulmonic heart. This organ gives origin to a large artery, which, soon after it quits the heart, divides into four branches, of which one pair goes to each pair of branchiz. From the branchie, the blood is re- turned through vessels which unite and forms the aorta. The aorta, in its turn, again subdi- vides and sends branches to the different parts of the body. From each of these the vessels again reunite, form the vena cava, and convey the blood once more to the heart. Through the whole of this course, it has been supposed that the pulmonic heart alone, with the