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This volume, happily devised by Professor Dunlap to meet this real need, at first in his own pupils and later in a wider public, will materially help this progress, for it has within it in fairly up-to-date and simple form much of the structure and function, always of surpassing interest when understood, of the human action-system.
They consist of a series of precisely similar reaction-devices, any one or all of which may be used in connection with a given observation. These reaction-mechanisms are so chosen as to be suited to the structure and action-system of the animal to be studied.
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