Chapter III: What Takes Place When We Move

13. “ The Bones of the Arm 21

14. “ The structure of the Elbow Joint 23

15. “ Other joints in the body 25

16. “ The arm is bent by the contraction of the Biceps Muscle 26

17. “ How the will makes the Biceps Muscle contract 32

18. “ The power of a muscle to contract depends on its being
supplied with blood 35

19. “ It is the food in the blood which gives the muscle strength 37

20. “ The continual need of food 38