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Published online by Cambridge University Press: 19 February 2018
This subject will be best studied by first considering the evolution of reflex action on the lines laid down by Herbert Spencer.* Reflex action is first displayed in its crudest form in the contraction which occurs when the amoeba is touched, but not till there is a differentiation between the tissue which conducts and the tissue which responds to a stimulus, can reflex action be said to be thoroughly developed.
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