IN HUMAN PHYSIOLOGY. 169 



The muscles and blood-vessels of the surface are con- 

 tracted by the cold, and the blood is driven back toward 

 the heart. The reaction which ensues forces the blood 

 again toward the skin, and this flushes with the incoming 

 tide. The face is therefore first whitened and then red- 

 dened. 



13. What must be r'he effect of tight lacing upon the circu- 

 lation of the blood ? 



It must, by contracting the blood-vessels, impede the 

 flow of the blood, and by decreasing the quantity fur- 

 nished the various organs, injure their action. Thus, 

 finally, it will impair the quality of the blood. 



14. Do you know the position of the large arteries in the 

 limbs, so that in case of accident you could stop the flow of 

 blood i 



These can be located by examining the cut in Physi- 

 ology, page 104, or any good chart of the circulation. 



15. When a person is said to be "good-hearted" is it a 

 physical truth ? 



The expressions, large-hearted, good-hearted, etc., are 

 remains of the old idea that the affections are located in 

 the heart rather than in the brain the seat of the mind 

 and all its attributes. 



16. Why does a hot foot-bath often relieve the headache 1 } 



(See Physiology, pages 127-8.) 



It withdraws blood from the head, and so relieves the 

 congested state of that organ. 



