viii CONTENTS 



Attachment of muscles to the thighbone which give it stabil- 

 ity, Fig. 16 , G3 



The greater breadth of the pelvis in women requires a greater 

 turning out of the toes, and consequently of the whole foot 64 



Comparison of the form of the thighbone with the dishing of 

 a cart wheel, and the reason for it. See Fig. 17 ... 65 



The thighbone most nearly perpendicular when it has the 

 most weight to bear, Fig. 18 66 



CHAPTER V 



OF THE TENDONS COMPARED WITH CORDAGE 



Where nature has provided a perfect system of columns, 

 levers, and pulleys, she gives curiously constructed cords 

 for their movements ; she spins better yarns and they are 

 interwoven. See Fig. 19, A and B 70 



As the methods of splicing and plaiting in the subdivision 

 of the rope make a texture stronger than the original 

 rope, so is the animal tendon made stronger by the inter- 

 weaving with another strand 71 



Of the breaking of tendons in advanced life 72 



CHAPTER VI 



OF THE MUSCLES OF MUSCULARITY AND ELASTICITY 



The muscles, the only organs which properly have the power 

 of contraction 73 



Movement of the blood in the arteries kept up by their elas- 

 ticity; the cause of elasticity unknown 74 



Muscles have a tissue of nerves 76 



Muscles of the forearm, Fig. 20; third kind, weight and 

 velocity are equivalent; Fig. 21, power lost and velocity 

 gained 77, 78 



Same principle holds in animal machinery; by acquired 

 velocity we drive a nail so of the fly-wheel. Fig. 22 and 

 Fig. 23, illustrations of principle 79, 80 



Action of oblique muscles in drawing together ribs, Fig. 24 . 81 



Fig. 27, illustration of bending foot on leg 83 



