x CONTENTS 



PART IV 



HUMAN STRUCTURE AND PHYSIOLOGY 

 (Chapters XXI-XXVIII by Isabel McCracken) 



CHAPTER PAGE 



XXI. INTRODUCTION, AND THE CHEMISTRY OF PHYSIOLOGY . 287 



XXII. DIGESTION AND ABSORPTION . . . 303 



XXIII. THE BLOOD AND CIRCULATION . . . 316 



XXIV. THE SKELETON AND MUSCLES . . 329 

 XXV. RESPIRATION AND EXCRETION .... 343 



XXVI. NERVOUS SYSTEM ... . 357 



XXVII. THE SPECIAL SENSES . . .368 



XXVIII. MICRO-ORGANISMS AND SANITATION .... 379 



XXIX. ANCIENT AND MODERN MAN ...... 384 



PART V 



ANIMALS IN RELATION TO EACH OTHER, TO PLANTS, AND 



TO THE OUTSIDE WORLD 



XXX. THE STRUGGLE TO LIVE, ADAPTATION, DISTRIBUTION, ETC. 399 



XXXI. PARASITISM AND DEGENERATION . . . 411 



XXXII. MUTUAL AID AND COMMUNAL LIFE . 421 



XXXIII. THE COLORS AND MARKINGS OF ANIMALS, AND THEIR USES 438 



XXXIV. INSECTS AND FLOWERS ....... 450 



APPENDICES 



1. STUDENT AND CLASSROOM EQUIPMENT AND METHODS . 467 



2. REARING ANIMALS AND MAKING COLLECTIONS . . 469 



INDEX 483 



