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$ curious inequality may lie in the circumstance that reflex flexion of the 
4 limb of itself induces as a sequence to itself extension, so that no local 
stimulus is, in so far, required for extension. The same argument may also 
apply to the analogous inequality of jaw opening and jaw closing, both 
as locally elicitable reflexes and in their primary representation in the 
“motor” cortex.* At root of the inequality with which movements of 
opposite direction, forming complemental pairs, are represented, both in the 
fields of local reflex action and in the “motor” cortex cerebri, may lie 
‘successive induction.” 
* Ibid., and ‘Journ. of Physiology,’ vol. 34, p. 315. 
