Show physiological FACTS ana skin is rough because by that means it is better adapted to receive sensations CHILDREN are not born with teeth on account of the inconvenience that would be occasioned by these in very early life THE bones of the arm are long cylinders because in this shape they have the strength with the least expenditure of material DEAF persona frequently hear remarks in a moderate voice better than in a shout because too loud a sound has a tendency too stun the membranes of alie ear THE skull is the only cavity of the body not by a membrane because the brain being so important a portion of the system needs careful protection tec tion contortionists are more graceful in their motions than other people because of the greater flexibility of their limbs caused by continual exercise ane stomach has a churning motion which during the progress of digestion is continuous in order that the food may be properly mixed with the gastric juice VENOUS blood is blue or almost black because it contains many impurities collected from the system and has not itself been purified by contact with the air in the lungs sniff the air to locate an odor because by dis tending the nostrils a larger quantity of air is drawn in tha nerves are better exposed and the odor more clearly perceived |