The world often describes with minuteness the material framework of such noisy events as have impressed its coarse sensibilities. But it commonly neglects, because ignoring, the scenes wherein have taken place the crises of thought, or occurred the birth of new, indomitable ideas. To the thinker, however, such outer scenes remain inextricably associated with the thought that has sprung to life in their midst. To this day I preserve a vivid recollection of every item of the place where I read the story of Vesalius; the lofty reading-room, with its confused lining of many-colored books, the tables crowded by eager students, the broad, deep windows through which the sun streamed, and from which I, sitting with open folio on my lap, watched the shifting fountain and the swaying trees and the long, untrimmed grass in the courtyard below. For the story seemed to have laid hold of my inmost soul, and touched the spring of a long-hidden desire. Why I was so moved, I could not tell. What issue would open to this whirlpool of vague excitement in which I had fallen, I had no idea. But I was profoundly conscious both of the excitement and the emotion, and, with that refined epicureanism of which intellectual people alone are capable, I abandoned myself, for a time, to the subtle luxury of their enjoyment. My reverie was interrupted by the clanging of the great clock and the scarcely less harsh voice of the _gardien_ as he announced the hour for closing the library. Still wrapped in fantastic meditation, I descended the stairs to the street, and followed the rue Richelieu to the boulevard, there to mingle with the human stream that endlessly encircled the city like a new army of Gideon. Drifting in the current, I reached the Bastile, crossed the Pont d'Austerlitz, gained the Boulevard de l'Hopital and continued walking to the Invalides, to the Avenues Jena and Wagram, and from the Place des Ternes, all along the exterior rampart. And as I walked, my entangled thoughts gradually disengaged themselves into clearness and precision.