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X CHAPTER III. HEAT.Sensations of heat and cold—The theory of heat—Cold a relative term—Heat as a mode of motion—Radiation—Conduction—Good and bad conductors—Vital temperature—Oxygen as producing heat by chemical combination—Friction as a cause of heat—Heat and work—The development of heat by the contraction of muscles—Combustion in the body in relation to food—How and why we lose heat—Nature's protections against this loss—A popular fallacy—Clothes supplementary to the skin—Primitive dress 32

CHAPTER IV. COLD, AND THE HARM IT DOES.The action of cold on the human body—Insufficient nutrition—Danger from cold greatest in the case of infants—Diseases occasioned by cold—Infantile mortality—Mortality in Russia—Growth—Cold an enemy to growth—Normal growth-rate of children—Temperature of rooms—Ventilation— The sufferings of children from insufficient clothing—"Coddling" versus "Hardening"—The hardening theory a fallacy 46

CHAPTER V. HOW TO DRESS INFANTS.Evils of the fashionable layette—Swaddling—Bad old fashions—The binder—The sanitary binder— All sudden change dangerous—Too light clothing for infants—The liability of the infant nervous system to disturbance—Convulsions—The mortality therefrom—Convulsions caused by the