The present warning issues with no uncertain sound, because this great battle for preservation and conservation cannot be won by gentle tones, nor by appeals to the aesthetic instincts of those who have no sense of beauty, or enjoyment of Nature. It is necessary to sound a loud alarm, to present the facts in very strong language, backed up by irrefutable statistics and by photographs which tell no lies, to establish the law and enforce it if needs be with a bludgeon. This book is such an alarm call. Its forceful pages remind me of the sounding of the great bells in the watch-towers of the cities of the Middle Ages which called the citizens to arms to protect their homes, their liberties and their happiness. It is undeniable that the welfare and happiness of our own and of all future generations of Americans are at stake in this battle for the preservation of Nature against the selfishness, the ignorance, or the cruelty of her destroyers.