. Endocrinology. on or experimental eryptorchism has been performed whenyoung, have a longer life than their normal brothers. These experiments I shall reserve for later publication. 1will give here only a single regeneration experiment with a verysuccessful result, on a hunting dog (for details see Coinpt. rend,de laSoc. de biol., 1921). In May, 1921, a pedigreed German pointer, 1272 years old, whoselife the owner despaired of, owing to senile changes, was brought tome. He contemplated having the dog killed. I took the precaution ofsending the animal to Prof. Hansen of the Royal Veterinary Co
. Endocrinology. on or experimental eryptorchism has been performed whenyoung, have a longer life than their normal brothers. These experiments I shall reserve for later publication. 1will give here only a single regeneration experiment with a verysuccessful result, on a hunting dog (for details see Coinpt. rend,de laSoc. de biol., 1921). In May, 1921, a pedigreed German pointer, 1272 years old, whoselife the owner despaired of, owing to senile changes, was brought tome. He contemplated having the dog killed. I took the precaution ofsending the animal to Prof. Hansen of the Royal Veterinary Collegefor a preliminary report. This affirmed that the dog suffered frompronounced senility, with the symptoms of dull eyes, thin coat, deaf-ness, and thickened, inelastic skin. It could move only with difficulty,was emaciated and often had incontinence of urine and feces; therewere no signs of organic disease except a slight albuminuria, which isso frequent in old dogs; a tuberculin test proved negative. In spite. of misgivings as to whether an anaesthetic would be borne, I per-formed, on May 2-3, resection of the left epididymis and right-sidedvasectomy. At the end of June the animal was returned to his owner,who, on Oct. 25, wrote that three or four weeks after his dischargethe dog became brisker, its appetite better and its coat thicker. Bythe end of August it could run behind a bicycle ridden slowly, and thesexual appetite revived; sight improved and it no longer slept all September great strides were made, so that the owner again usedit for sporting purposes and regarded it as equal in every way to adog seven years old. The animal was again examined by the veter-inary authority, who expressed great surprise at the change in it.(See Figs. 7-10). 2-4 EXDOCRIKOLOGY OF SEXUAL GLANDS In spite of its precarious condition at the time of operation, thedog lived for more than a year after. It died June 12, 1922. during astay in the country, unfortunately at a time when the a
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