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• 01:33, 25 November 2025 172.18.0.1 talk created page Popular Science Monthly Volume 19 September 1881 The Blood And Its Circulation II (Created page with "<br>By HERMAN L. FAIRCHILD. IN vertebrates alone is there a closed circulation-a complete system of tubes from whence the blood never escapes into the body-cavity. We find an approach to it in the higher mollusks. Indeed, in power and general effectivity, the circulation of the very best mollusks is enormously superior to that of the low vertebrates. Nevertheless, the completely closed circulatory system of even the bottom vertebrates is of higher kind. Although the circ...")