Local Effects on the Feather Papilla of Thyroxine and of Progesterone.

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Abstract
Respective local actions upon the feather papilla of thyroxine and progesterone were examined. Application was made by intradermal injection to the immediate vicinity of the resting, quiescent and plucking-stimulated papillae. Thyroxine caused proliferation in all 3 circumstances; progesterone proved negative with this technique in the resting and quiescent states; it may have exerted a slight augmentation in the third.