¶ The cities of today _look_ different from the jungles of our ancestors and we imagine that because the brain of man overcame the old menaces no new ones have arisen to take their place. We no longer fear extermination from cold. We turn on the heat. We are not afraid of the vast oceans which held our primitive forebears in thrall, but pass swiftly, safely and luxuriously over their surfaces. And soon we shall be breakfasting in New York and dining the same evening in San Francisco! Facing New Enemies ¶ But in building up this stupendous superstructure of modern civilization man has brought into being a society so intricate and complex that he now faces the new environmental problem of human relationships. The Modern Spider's Web ¶ Today we depend for life's necessities almost wholly upon the activities of others. The work of thousands of human hands and thousands of human brains lies back of every meal you eat, every journey you take, every book you read, every bed in which you sleep, every telephone conversation, every telegram you receive, every garment you wear. And this fellowman of ours has multiplied, since that dim distant dawn, into almost two billion human beings, with at least one billion of them after the very things you want, and not a tenth enough to go around! Adapt or Die ¶ Who will win? Nature answers for you. She has said with awful and inexorable finality that, whether you are a blade of grass on the Nevada desert or a man in the streets of London, you can win only as you adapt yourself to your environment. Today our environmental problem consists largely of the other fellow. Only those who learn to adapt themselves to their fellows can win great or lasting rewards. Externals Indicate Internal Nature ¶ To do this it is necessary to better understand our neighbors--to recognize that people differ from each other in their likes and dislikes, traits, talents, tendencies and capabilities. The combination of these makes each individual's nature. It is not difficult to understand others for with each group of these traits there always goes its corresponding physical makeup--the externals whereby the internal is invariably indicated. This is true of every species on the globe and of every subdivision within each species. Significance of Size, Shape and Structure ¶ All dogs belong to the same species but there is a great difference between the "nature" of a St. Bernard and that of a terrier, just as there is a decided difference between the natures of different human beings. But in both instances the actions, reactions and habits of each can be accurately anticipated on sight by the shape, size and structure of the two creatures. Differences in Breed