“To diminish by any great amount the number of these invisible molecules of the vapor of water, is to immediately render the earth uninhabitable, notwithstanding its oxygen; even the equatorial and tropical regions will suddenly lose their heat and will be condemned to the cold of mountain summits covered with perpetual snow and frost: in place of luxurious plants, of flowers and fruits, of birds and nests, of the life which swarms in the sea and upon the land; instead of murmuring brooks and limpid rivers, of lakes and seas, we shall be surrounded only by ice in the midst of a vast desert—and when I say _we_, gentlemen, you understand we shall not linger long as witnesses, for the very blood would freeze in our veins and arteries, and every human heart would soon cease to beat. Such would be the consequences of the suppression of this half hundredth part of aqueous vapor which, disseminated through the atmosphere, beneficently protects and preserves all terrestrial life as in a hot-house. [Illustration: PRIMARY VEGETATION AT THE NORTH POLE. ] “The principles of thermodynamics prove that the temperature of space is 273° below zero. And this, gentlemen, is the more than glacial cold in which our planet will sleep when it shall have lost this airy garment in whose sheltering warmth it is today enwrapped. Such is the fate with which the gradual loss of the earth’s water threatens the world, and this death by cold will be inevitably ours, if our earthly sojourn is long enough.