. Animal and vegetable physiology, considered with reference to natural theology. Biology; Physiology; Plant physiology; Natural theology. 1S4 THE VITAL FUNCTIONS. is distinguished from the annclida ah'cady noticed, by being more highly organized, and possessing a more extensive cir- culation, and a more comj)licated apparatus for the perform- ance of this function. Tlic greater extent of vascular rami- fications appears to require increased powers for carrying the blood through the numerous and intricate passages it has to traverse; and these are obtained by means of muscular recc})taclcs, ca
. Animal and vegetable physiology, considered with reference to natural theology. Biology; Physiology; Plant physiology; Natural theology. 1S4 THE VITAL FUNCTIONS. is distinguished from the annclida ah'cady noticed, by being more highly organized, and possessing a more extensive cir- culation, and a more comj)licated apparatus for the perform- ance of this function. Tlic greater extent of vascular rami- fications appears to require increased powers for carrying the blood through the numerous and intricate passages it has to traverse; and these are obtained by means of muscular recc})taclcs, capable, by their successive contraction, of add- ing to the impulsive force witli which the blood is driven into the trunks that distribute it so extensively. These mus- cular appendages are globular or oval dilatations of some of the large vascular trunks, which bend round the sides of the anterior part of the body, and establish a free communication between the dorsal and the abdominal vessels. They are described by Duges as consisting, in the Linyibricus gigas, of seven vessels on each side, forming a series of rounded dilatations, about twelve in number, resembling a string of beads.* In the Lnmhricus ierresiris, or common earth-worm, there are only five pairs of these vessels; they have been de- scribed and figured by Sir E. Home if but the most full and accurate account of their structure has been given by Mor- ren, in his splendid work on the anatomy of that Fig. 349, which is reduced from his plates, represents these. • They arc termed by Duges, Vaisseaux monlliformes, ou dorso-abdor^i- naux.—Annalcs dcs Sciences Natiirelles, xv. 299. f Pliilos. Transact, for 1817, p. 3: and Pi. iii. Fig. 4. t " De Lunibrici tcrrcstris Ilibtom naturalis, nccuon Anutomia ; Qto. Bruxelles, Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these ill
Size: 2452px × 1019px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury18, booksubjectnaturaltheology, booksubjectphysiology
