X CONTENTS 



Part V 

 ORGAN SYSTEMS OF MAN 



14. Housing — Skin and Its Derivatives 365 



15. Support and Movement 374 



16. Coordination 392 



17. The Digestive System 451 



18. The Breathing Svstem 475 



19. The Transportation System 490 



20. MetaboHsm of Foods and Disposal of Wastes 518 



21. Reproduction 529 



Part VI 

 CONTINUITY OF LIFE 



22. The Continuity of Cells 551 



23. Development of the Individual 560 



24. Continuity of the Race 581 



Part VII 

 ORGANIC EVOLUTION 



25. Evolution — Past and Present . . .' 623 



26. Theories and Mechanism of Evolution 649 



CLASSIFICATION OF THE ANIMAL KINGDOM 671 



ANNOTATED REFERENCES "... 675 



ACKNOWLEDGMENTS 679 



GLOSSARY 683 



INDEX 703 



