CONTENTS xix 



353. Structural Adaptations 784 



354. Physiologic and Chemical Adaptations 784 



355. Color Adaptations 785 



356. Adaptations of Species to Species 787 



357. The Distribution of Animals 787 



358. Terrestrial Life Zones 789 



359. Marine Life Zones 794 



360. Fresh-Water Life Zones 797 



Chapter 39 

 PARASITISM 799 



361. Origin of Parasitism 799 



362. Ectoparasites 802 



363. Parasites of the Digestive Tract 806 



364. Parasites in Body Tissues 808 



365. Intracellular Parasites 813 



366. Adaptations to Parasitism 816 



367. Host Specificity 819 



368. Social Parasites 820 



Chapter 40 

 CONSERVATION 822 



369. .\griculture 822 



370. Forestry 824 



371. Wildlife 824 



372. Marine Fisheries 826 



373. Public Health 828 



374. Human Ecology 829 



Appendix 

 A SYNOPSIS OF THE ANIMAL KINGDOM 831 



BIBLIOGRAPHY 843 



INDEX 



849 



