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abstract action afferent afferent nerves animists appears biological conception blood brain carbon dioxide central nervous system chemical changes chemical conditions chemical elements chemical stimuli chemical substances co-ordination complex conscious activity constant constantly definite Descartes detail environment evidence examine excitability existence experience experimental expression facts germ-plasm growth human hydrogen ion concentration hypothesis ideal ideas imperfection indefinite individual influence inorganic world instance interpretation investigation Kant kidneys lecture living activity living body living organism logical maintenance manifest material matter and energy mechanistic theory ment metabolic natural selection nerves nervous response nervous system normal nutrition ordinary ovum oxygen partial pressure past perception personality phenomena philosophical physical and chemical physical or chemical physical sciences physical world physics and chemistry physiological practical present progress realise reality regard regulation relation reproduction respiration respiratory centre scientific sensations simply sodium chloride spatial standpoint stimulus substance supposed tion trace vital force vital principle vitalistic whole