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Excerpt from 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 <p>It will doubtless be incumbent upon us, to use much caution in extending the facts observed in the batrachia or 'm fishes, to animals higher in the scale. It will be necessary to exercise a just degree of reserve in passing from mere facts observed in one order of animals, to general conclusions in regard to others. <p>The fact of the removal of the entire brain and spinal marrow, in the frog, without the immediate extinction of life. <p>About the Publisher <p>Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com <p>This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.