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X CONTENTS 



CHAPTER VIII 



Some Aspects of Ecology 205 



Temperature. 



CHAPTER IX 



Some Aspects of Ecology (continued) ..... 228 



Humidity. Light. Atmospheric Pressure. Food. Climate. 

 Literature. 



CHAPTER X 

 The Practical Application of Ecology . .262 



Regulation of the Growth of the Crop. Resistant Varieties. 



CHAPTER XI 

 The Practical Application of Ecology (continued) . . . 286 



Host Selection and Biological Races. Ecological Aspects 

 of the Locust Problem. Literature. 



CHAPTER XII 

 Parasitism 315 



Introductory Remarks. Host Selection. I*hases of 

 Parasitism. 



CHAPTER XIII 



Parasitism (continued) ....... 330 



Types of Life-cycle. Host Relations of Parasites. Poly- 

 embryony and Related Phenomena. The Behaviour of 

 Adult Parasites. Literature. 



CHAPTER XIV 

 Biological Control 368 



Biological Control of Insect Pests. I. Parasite Intro- 

 ductions. 



CHAPTER XV 



Biological Control (continued) 391 



II. Factors Governing Parasite Introductions. HI. The 

 Utilisation of Indigenous Parasites. Biological Control of 

 Noxious Weeds. Literature. 



Index of Authors ........ 421 



General Index 426 



