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752 is reason to believe that their efficient cause of action, whatever it may be, emanates from the blood itself. Let us then, Gentlemen, dispense with the hypothetical part of the medical reasonings of the present day, and confine ourselves, for practical purposes, to the facts. I am quite satisfied, that so far as the theory of respiration goes, this course will be found of great value in the sick chamber. Let us study and impress upon our minds the indispensable relations of blood and airdoi:10.1016/s0140-6736(02)66588-2 fatcat:kxlzqd5ckncohi64cn5zicvyrm