. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. 670 CIRCULATION. motions of the red globules principally, for it is very rarely indeed that the current of fluid which carries the globules along can be recog- nized in the ordinary modes of observation. The capillary circulation is most easily seen in cold-blooded and in young animals, both on account of the large size of the red glo- bules and the small number of the vessels. Since the first discovery of the capillary circu- lation by Malpighi, the transparent web be- tween the toes of the hind feet of the frog has bee
. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. 670 CIRCULATION. motions of the red globules principally, for it is very rarely indeed that the current of fluid which carries the globules along can be recog- nized in the ordinary modes of observation. The capillary circulation is most easily seen in cold-blooded and in young animals, both on account of the large size of the red glo- bules and the small number of the vessels. Since the first discovery of the capillary circu- lation by Malpighi, the transparent web be- tween the toes of the hind feet of the frog has been universally adopted as the most con- venient situation for observing this beautiful spectacle with transmitted light. The fins and tail of fishes, the tail of the larva of the Frog and Newt, the external gills of the same ani- mals as well as of cartilaginous fishes, the mesentery of the Frog or of small warm- blooded animals, the wing of the Bat, the lungs and urinary bladder of Reptiles, the liver of the Frog and Newt, the membranes of the incubated egg, the yolk of the Skate's egg, are all situations favourable for the ob- servation of the capillary circulation. The capillary circulation has been viewed in only a small number of warm-blooded animals, and in very few of their textures; but the minute injection with coloured fluids of all parts of the bodies of Quadrupeds and of Man leaves little doubt that in them also, whatever vari- eties there may be in the size, number, and distribution of the small vessels, the blood passes in every organ from the small arteries into the returning veins by minute continuous tubes of the same nature as those more easily observed in the situations above-mentioned. Some are inclined to consider the minutest or proper capillary vessels as destitute of vas- cular parietes, and consisting of mere passages through the texture of the organ in which they exist without any lining membrane. This opinion is founded on the impossibility of seeing
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