THB REASON -WHY. 



21. 



Though hand join in hand, the wicked shall not be unpunished ; but the seec 

 of the righteous shall bade irered." PEOVEEBS xxi. 



boats pass into the axillary canal and Shoulder-town is supplied ; 

 the other boats proceed along the humeral canal until they ap- 

 proach Elbow-town, when another division of the boats pass into 

 other branch canals and supply the wants of the neighbourhood ; 

 the others have passed into the ulnar canals and the radial canals 

 until they have approached Wrist-town and Hand-town, which are 

 respectively supplied ; and then the two canals have formed a junc- 

 tion across the palm and supplied Palm-town, where they have 

 given off branches and boats to supply the four Finger-towns, and 

 Thumb-town. 



Between A and B the brachial 

 canal, which gives off branches to 

 supply Elbow-town, Ac., and then 

 divides into two main courses, di- 

 verging to the opposite sides of the 

 arm, and sending a smaller canal 

 down the centre. 



D D. The point where the ulnar 

 canal and the radial canal, after 

 having passed and supplied Wrist- 

 town, form a junction, running 

 through Palm-town, and in their 

 course giving off branches to supply 

 the four Finger-towns and Thumb- 

 town. 



For further explanations of the 

 engraving, see 57. 



895. How does the blood 

 return to the lungs, after it 

 has reached the extremities ? 

 The veins constitute a sys- 

 tem of vessels corresponding 

 to the arteries. We may say 

 that the arteries form tke down 

 canal, and the veins the up 

 canal. The arteries, com- 

 mencing in the great trunk ol 

 the aorta, branch off into larjre 

 and then into -smaller tubes, 

 until they form capillary or 

 Fie. 52. - ILLUSTRATION OP TUB hair-like vessels, penetrating 



SYSTEM 0V CANALS THAT 8UPPI.T 



THB FORE-ABU WITH B*ooD. 



