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It has been observed by Mr. Cruickshank, and the same observations have been made by M. Bichat (in hisRécherches Physiologiques sur la Vic et la Mort ), that the brain is not directly necessary to the action of the heart; and that when the functions of the brain are destroyed, the circulation of the blood ceases only in consequence of the suspension of the respiration. The former of these observations Mr. Brodie had found to be correct; for if the spinal marrow were divided, though the respiration was thereby immediately stopped, still the heart continued to contract, and to propel forward, for a short time, dark-coloured blood; and even when the head was entirely removed, if the blood-vessels were secured by ligature, the circulation seemed unaffected by the entire separation. It appeared, therefore, in conformity to the second observation, to cease solely in consequence of the suspension of respiration; but Mr. Brodie conceived that this point might admit of direct proof by experiment; for in that case the heart should continue to act for a greater length of time, if the process of respiration were carried on artificially.

abstracts of the papers printed in the philosophical transactions of the royal society of london

The Croonian Lecture. On some physiological researches, respecting the influence of the brain on the action of the heart, and on the generation of animal heat