LIST OF DIAGRAMS IN THE TEXT 



FIG, PAGE 



1. Zonation of corals on a reef in the New Hebrides. . . 15 



2. Stages in ecological succession on Oxshott Common 



3. Food relations of the herring to the North Sea plankton 



community ........ 



4. Food-cycle among the animals on Bear Island 



5. Food-cycle on young pine-trees on Oxshott Common 



6. Food-cycle of tapeworm through rabbit and fox 



7. Food-cycle of tapeworm through fish .... 



8. Food-chains of parasites and carnivores 



9. Effect of man on polar bears and seals 



10. Food-relations of tsetse, dragonfly, and bee-eater . 



11. Periodic fluctuations in numbers of lemmings 



12. Fluctuations in the numbers of Canadian mammals 



13. Diagram of food-chains and sizes of animals in a Canadian 



animal community ....... 



58 

 58 

 66 



76 

 76 

 80 

 121 

 122 

 134 

 136 



178 



