CHAPTER XVIII. GRAVE QUESTIONS But the projectile had passed the enceinte of Tycho, and Barbicane and his two companions watched with scrupulous attention the brilliant rays which the celebrated mountain shed so curiously over the horizon. What was this radiant glory? What geological phenomenon had designed these ardent beams? This question occupied Barbicane’s mind. Under his eyes ran in all directions luminous furrows, raised at the edges and concave in the center, some twelve miles, others thirty miles broad. These brilliant trains extended in some places to within 600 miles of Tycho, and seemed to cover, particularly toward the east,