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abnormal activity animals aspect become biological biologist biosphere birds birth-control blood body born brain buds butyric acid called cells chemical child civilised cosmosphere defect deteriorative doubt ductless ductless glands enthusiasm for health environment eugenics evolution fact fatigue fore-brain Francis Galton function germ-cells germinal glands heart hereditary nature heredity hookworm hormones human hygiene implies important individual infection influence inheritance Karl Pearson less living creature mammals man's means Mendelian inheritance mental merry heart microbes microbic diseases mind modifications natural selection nerve-cells nervous system ness normal nurture occupations offspring organism oxygen pancreas parasites parents peculiarities Pembrey physical physiological physiology plants play poisons Professor progress race reason recognise regard reproductive senescence sense sex-urge sifting skin social sometimes struggle for existence sub-health suggest things threadworm thyroid thyroxin tion tissues ture variations vigour vitamins wholesome Wild Nature young youth