Dr. S-- stepped gingerly forward, a tall, effective man with hair hardly sanguine in color, and quite conventional in arrangement, with a cerebral development, that somehow disappointingly dwarfed the lower contours of his face, domed and broad as it was, with much scholarly promise. He was followed by the speaker of the evening, Mr. Binn, who seemed half inclined to screen himself from observation behind the utterly inadequate profile of the famous Director. The two men momentarily catching the full assault of the numerous eyes, each pair among them being the visible battery of a questioning and critical mind behind it, underwent an obvious confusion of intention and movement, and became somewhat mixed up with the table and chairs, and with each other. The Director extricated himself, came forward to the edge of the platform, and in a voice of half propitiatory jocularity, introduced the subject, and the speaker. He alluded to the favorable conjunction of the meeting of the American Association for the Advancement of Science and that of the National Academy of Science, which brought so many eminent thinkers and observers together, and administered an especial emphasis to the question to be considered this evening. He mentioned, with a deferential bow in the direction of the President, that they had all been deeply honored by the presence of the Chief Executive of the Nation, to whom perhaps, more than to anyone else in the brilliant audience, the grave question of the structural and geological stability of the Isthmus of Darien, was one of overshadowing interest, and he congratulated everyone that the subject was in the hand “of one whose geological fame was beyond dispute, and his carefulness of statement unimpeached,” and the Director sat down, pulling off to one side of the stage, lest his own refulgence might dim the legitimate monopoly of that article by Dr. Binn. Leacraft observed that as the lecturer unrolled his manuscript on the reading desk, the President leaned outward, adjusted his eyeglasses, and scrutinized the geologist, who, from a rather embarrassed fumbling with his sheets, seemed conscious of the inquisition. A moment later, as if satisfied with his inspection, the President leaned back, bulky and immobile, and became an absorbed listener. Mr. Binn, well known for his lithological studies, and the possession of a good style, in the scientific sense, was a short man, evincing, under control, however, the peptic influences of years, with a face of decided legibility, in which sense and penetration seemed equally indicated.