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The physiological optimum
First Part Voluntary Birth Control in its individual aspect
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abortion advantage already amongst animals become better birth rate birth-control birth-rate bring cause cells child circumstances coitus interruptus consequence countries course death disease duty economic especially ethical Eugenics evil evolution excess fact factor favorable fecundity feel formerly France genius germ-plasm German Empire greater happiness Hermann Brehmers higher human hygienic ideal increase individual infantile mortality influence instance knowledge of preventive labor limit living longer Malthus mankind manner married married couple matter means mother motives mutual Nature North Brabant nourishment number of births number of children number of marriages organs overpopulation parents Paul Robin physiological optimum poor population question possible practice pregnancy preventive intercourse preventive methods principle procreation production proletariat prostitution race reason regard rich selection selfishness sexual abstinence sexual intercourse social society soon South Holland statistics sterile struggle for existence things wages wife woman women