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adjustors anatomy animals axis of spin axle bacilli bacteria Bagehot become blood body boomerang catalysis catalytic cause cell central nervous organ changes chemical chemistry choanocytes cholera colloidal complement course curved dotted arrow Darwin Darwinian developed diphtheria direction disk effect effector electric electromotive force energy engine shaft fact fly-wheel force galvanic cell germs Gibbs gyrostat wheels gyrostatic action hastened precession heart heart-beat heart-muscle human immunity important individuals infection INFECTIOUS DISEASE intellectual jaws JOSIAH WILLARD GIBBS large numbers leucocytes logic medical school medicine metazoans muscle natural selection neuromuscular mechanism neurone opsonin Origin of Species phagocytes physical physiological poisons precession precessional motion principle produced reaction represents the spin-momentum represents the torque RESISTANCE TO INFECTIOUS scientific shown in Fig SOCIAL EVOLUTION Spencer sphincter sponges struggle for existence substances teeth tetanus theory tion top view torque toxin turning typhoid University vaccination velocity vertebrates zoology