VARIABILITY AND UNRELIABILITY IN THE DETERMINATION OF THE OPSONIC INDEX.

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Abstract
Huxley has said, "The man of science has learned to believe in justification, not by faith, but by verification." With this in mind, throughout the past nine months, I have been engaged in a study of the practical utility of the opsonic index as a factor in the diagnosis, prognosis and therapeusis of disease. Lest my attitude on this question be misinterpreted, I desire primarily to state that I have no reason to doubt, and, on the contrary, entertain implicit faith in the theory of opsonins; but as to the practicability of the index in medicine, my experiments have occasioned the gravest skepticism, if not absolute pessimism, relative to its utility for the profession at large. Slow as the perfection of the delicate technic for the determination of the phagocytic power of the blood necessarily was, it is rather surprising to note that approximately but one year has elapsed since

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