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able abroad activity amount of hormone animals appearance appetite arcus senilis arteriosclerosis atrophied attacks beard Berlin bladder Blood pressure castrated Climacteric clinical coitus complete condition confirmed Consultation desire and potency Double-sided ligation Dynamometer effect emission endocrine epididymis erections erotisation eunuchoidism experimental experiments favourable feeling functional growth hair Heft histological hormone hormonopoiesis hydrocele hypertonia implanted important improvement increase in weight incretory system internal secretion interstitial cells Letter Leydig cells Lichtenstern ligature Lipschiitz male mental months after operation nervous substratum normal observation occur old age one-sided ligation organs penis physical physiological present produced prostate pruritus puberty gland regard rejuvenation Right vasoligation Sand sclerosis secondary sex-characters seminal cells senile senile animals Senium Sertoli Sertoli cells sexual desire sexual glands sexual potency Sexual power skin sleep spermatic duct spermatogenesis Steinach Steinach's operation suffered testicle testicular theory threshold amount tion transplantation treatment tremor trouble tuberculosis Urine vasoligation weeks