CARTOUCHES OF AMENTHES, THOTH, AND THEIR COMBINATION 323 PHENOLOGY CURVES—EARTH 342 PHENOLOGY CURVES—MARS 343 PART I NATURAL FEATURES MARS AND ITS CANALS CHAPTER I ON EXPLORATION From time immemorial travel and discovery have called with strange insistence to him who, wondering on the world, felt adventure in his veins. The leaving familiar sights and faces to push forth into the unknown has with magnetic force drawn the bold to great endeavor and fired the thought of those who stayed at home. Spur to enterprise since man first was, this spirit has urged him over the habitable globe. Linked in part to mere matter of support it led the more daring of the Aryans to quit the shade of their beech trees, reposeful as that umbrage may have been, and wander into Central Asia, so to perplex philologists into believing them to have originated there; it lured Columbus across the waste of waters and caused his son to have carved upon his tomb that ringing couplet of which the simple grandeur still stirs the blood:— Á CASTILLA Y Á LEON NUEVO MONDO DIÓ COLON; (To Castile and Leon beyond the wave Another world Columbus gave;) it drove the early voyagers into the heart of the vast wilderness, there to endure all hardship so that they might come where their kind had never stood before; and now it points man to the pole.