viii THE ENGINES OF THE HUMAN BODY 



CHAP. PAGE 



11. HOW HARVEY DISCOVERED THAT THE HEART 



IS A DOUBLE PUMP ..... 97 



12. HOW A "HEAD OF PRESSURE" IS MAINTAINED 



IN THE ARTERIES ..... I08 



13. A PAIR OF LIVING BELLOWS . . . . 1 20 



14. RESPIRATORY CHAMBERS .... 1 33 



15. CONTRIVANCES FOR REGULATING THE HEAT 



OF THE HUMAN MACHINE . . . I46 



16. A SURVEY OF THE WORKSHOPS AND LABORA- 



TORIES OF THE HUMAN BODY, WHERE FOOD 



IS TURNED INTO FUEL FOR THE TISSUES . 1 59 



17. A TRANSPORT SYSTEM OF A PECULIAR KIND . 1 70 



18. THE REGULATION OF A FACTORY FOR THE 



PREPARATION OF TISSUE-FUEL . . . l8l 



19. THE BIGGEST AND BUSIEST FACTORY IN ALL 



THE BODY . . . . . .194 



20. A FACTORY THREATENED WITH DECAY . . 207 

 2 1. A POSTAL SYSTEM OF A PECULIAR KIND. . 220 



22. THE MASTER CONTRIVANCE OF THE HUMAN 



MACHINE ...... 2]2 



23. UNCOVERING THE MACHINERY OF THE BRAIN 243 



24. AUTOMATIC TELEPHONE EXCHANGES . . 2f2 



25. IN THE REPAIRING SHOPS .... 267 

 INDEX. ....... 276 



