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THE DUCTLESS GLANDS 



any rate within a certain period after the denervation, adrenin 

 does not cause active vasodilatation in the muscles. These 

 results agree well with what we find, namely, that when the 

 splanchnic nerve is stimulated peripherally and the sciatic 

 centrally in such a way as to give pressor responses, the intact 

 limb follows passively the blood-pressure, while the denervated 



Fio. 55. Same dog as in Fig. 54. The tracing is taken five minutes later 

 than in Fig. 54, after the adrenals on both sides had been tied off. Stimu- 

 lation of central end of right sciatic. 



limb constricts. It is only reasonable to suppose that this is 

 a natural consequence of the fact that in the denervated limb 

 the muscles do not actively dilate, and therefore fail to produce 

 the masking effect upon the skin constriction. We have been 

 able to satisfy ourselves on these points by injection of adrenin 

 as well as by stimulation of the nerves just referred to. This is, 

 in our opinion, to be regarded as a provisional answer to the 



