“I have myself made a fair number of experiments relative to the innervation of the mammary glands on female guinea-pigs.… Considering the contradictory results, it would be well to describe the experiments before arriving at any conclusions.… Experiment No. 1, June 10, 1874.--Guinea-pig in lactation. The mammary nerve on one side is laid bare, and insulated by means of a thread. The animal exhibits signs of acute pain, especially when the nerve is stimulated by an electric current; but the stimulation, prolonged during 10 minutes, produces no appreciable effect on the teats nor on the amount of milk secreted. I divided the nerve, and on the following day, June 11, there was as much milk in one gland as in the other; nor did the electric stimulation re-applied to both ends of the divided nerve produce any apparent effect on the glandular function.… I have selected these five experiments from those I had noted down in my book, as I made them under varying conditions. In all of them the results were negative.… Rochrig observed that in the goat the effects were different--as M. Lafont had said--which proves once more that the conclusions arrived at must not be generalized, and that the phenomena may vary considerably according to the species of animal.”--“_De l’Innervation de la Mamelle_,” _Report de la Soc. de Biologie, October 25, 1879_, “_Gaz. Méd. de Paris_,” 1879, p. 593.
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