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 living 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