. Agricultural zoology. Zoology. MAMMALS. 21 blood of the right half of the heart mixes with the richly oxygenated blood of the left half, the extent to which this mixing takes place being proportional to the size of the ^o.â-\\ //-â aperture. In Keptiles, therefore, the blood "-^'IH/ i r supplied to the Itmgs '^^ ' '"^ is not so poor in " "-â *-â-^â J|"^ [ oxygen as it might be, nor, on the other hand, is the blood supplied to the other parts of _ the body completely p^^_ of a Frog-s Heart. (The OXVSenated. As eon- ventricle K. Ib quite tindiv
. Agricultural zoology. Zoology. MAMMALS. 21 blood of the right half of the heart mixes with the richly oxygenated blood of the left half, the extent to which this mixing takes place being proportional to the size of the ^o.â-\\ //-â aperture. In Keptiles, therefore, the blood "-^'IH/ i r supplied to the Itmgs '^^ ' '"^ is not so poor in " "-â *-â-^â J|"^ [ oxygen as it might be, nor, on the other hand, is the blood supplied to the other parts of _ the body completely p^^_ of a Frog-s Heart. (The OXVSenated. As eon- ventricle K. Ib quite tindivliled: compare Figs. â¢' ° ff iT ⢠/T \ 9 and 10.) Other letters as in Fig. 10. sequences oi this : (1) respiration is feebler, and (2) the development of heat less than in Mammals and Birds { reptiles are cold-blooded), and (3) the chemical changes .taking place in the body (the metabolism) go on more slowly than in warm-blooded animals, and we can understand why reptUes execute fewer movements in a given space of time. In Amphibians ( frog) the two ventricles are similarly connected, but the opening is stiU larger than in Keptiles, and the partition-waU may even be altogether absent. It follows, therefore, that the mixing of the two kinds of blood is still more com- plete, and that Amphibians, too, are cold-blooded. The vertebrate sub-kingdom embraces the classes of I. Mammals; II. Birds; III. Reptiles; IV. Amphibians; V. Fishes. CLASS I.: MAMMALIA (SUCKLERS). Warm-blooded Vertebrates (p. 16), usually covered with hair, and bringing forth living young, that suck for some time after birth. The female is provided. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Bos, Jan Ritzema, 1850-1928; Ainsworth Davis, J. R. (James Richard), 1861-1934. London, Chapman & Hall, Ld.
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectzoology, bookyear1894
