186 



TWELVE 



conservation is not enough 



SUPPOSE THIS CHAPTER BEGAN BY SAYING THAT THE MORE 



thickly populated an area is, the fewer animals other than 

 man will be found to be hving there. No doubt I should 

 be told not to waste my reader's time by telling him that. 

 But the truth of the matter is that the statement would be 

 false or questionable at best. 



Consider for example a few square blocks in one of the 

 most densely populated sections of New York City. There 

 are, to be sure, probably fewer insects and worms below 

 the surface of the soil than in the country. But if you 



