IN THREE PARTS
There are but two paths along which the advance of medical science and art can be pressed; they are observation and experiment. The two lead to the same goal; both are beset with difficulties or even with obstacles which for the time being are, or may even forever be, insurmountable. In any case it is essential, in order to ascertain beyond peradventure that either of the paths has led us to our goal, to show that the two lead to the same place. Still, to have threaded one of the paths successfully usually assures an easy and early approach by way of the other. Indeed, the opening up of one path often leaves the finding of the other merely the matter of a single trial. When this is the case we are apt to lose sight of the fact that actually the goal has been reached by an advance pressed along both pathways.
ERLANGER J. ANIMAL EXPERIMENTATION IN RELATION TO PRACTICAL MEDICAL KNOWLEDGE OF THE CIRCULATION. JAMA. 1910;LIV(21):1680–1684. doi:10.1001/jama.1910.92550470001001f
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