THis paper is intended to show that in some cases of hemiplegia-let us say left-the trunk muscles of each side act weakly when they take part in left-sided move- ments, and the same muscles act normally when they take part in right-sided movements; also that the movements of the trunk requiring bilateral action of muscles are very little, or not at all, affected. The question isdiscussed of the change in representation of one and the same group of muscles from one hemisphere to the other accordingly as they act in right-sided or left-sided movements; and also the question of the representation of movements re- quiring bilateral action of muscles in one or both hemispheres.
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C. E. BEEVOR (1909) studied this question.