Abstract
THE re-examination of established principles often proves to be as effective a means of progress as the exploration of new fields. This is especially likely to occur in those instances where the weight of long tradition or great authority and the superficial appearance of reasonableness have combined to discourage the critical analysis of a doctrine. The demand for re-evaluation within recent years of two well buttressed concepts may therefore be viewed as important indications of progress in physiology and medicine. In both, which are discussed in the first two sections below, revision of basic physiologic tenets is involved, along with . . .
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