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50 West Fiftieth activity adoles ADOLESCENCE AND PUBERTY adolescent boys adolescent period adult adulthood American Social Hygiene animals attitude average awakening beginning behavior Bigelow's Sex Education biology boy or girl boys and girls cation cence changes chapter characteristics child chum COMMON COLD commonly concerning crushes early adolescence early childhood educational and hygienic emotional endocrine glands evidence fact fourteen growing-up growth habits height high schools homosexual hormones human illegitimacy individual late childhood lescence marriage masturbation menstrual menstrual period ment mental moral and social National Health Series natural outdoor ovaries and spermaries pancreas parents and teachers petting physi physical physicians physiological pituitary preadolescence problems of adolescence Profes puberty pubescent reader scientific self-stimulation selfish sex instinct sex organs sexual instinct sexual tendencies Social Hygiene Association stimulation teens tend thymus thyroid tion tomboy Tuberculosis twelve venereal diseases vidual West Fiftieth Street women writers York young youth