He kept on talking to himself, as was his learned habit, repeating with a hideous smile the words, "Crystals ... ah! yes ... crystals.... Crystals, eh? Crystals ... yes.... Crystallograph ... something, eh? Now then, it'll be among the books of reference, eh? Crystals.... Oh, what a dirty trick that was of Leader to play!" His left hand was fumbling in the left-hand pocket, where he always kept those indispensable instruments of research, his large tortoise-shell spectacles. His hand groped. He muttered the word "Berne" three times in less and less confident tones. Then the message so tardily conveyed reached his erudite brain. "Oh! ... I've lost my spectacles!" He never got used to the shock of losing his spectacles, though he suffered from it a dozen times a day. Each time he lost them it was all up with him; each time he went through a crisis. Here he was in the depths of the country and without eyes! There was a touch of agony in his muttering now, as came louder the words, "My spectacles, oh, ah! my spectacles ... now where could I ..." He bent his powerful will to the control of his, if possible, less powerful memory; he traced events back one after the other for a good three minutes, and then he remembered that he had gone out in his overcoat and had left it hanging in the hall. [Illustration: _The Professor gave an odd little scream like a shot rabbit._] He shambled out and groped in the recesses of the left-hand pocket, and there, side by side with his familiar handkerchief, the faithful companion of many days, was the feel of the rough spectacle case; it was all right, but also, what annoyed him a little, a pebble. It was natural that pebbles should get into one's pockets when one was out walking in the country; at least, he thought it was. He thought it went with those terrible animals called cows, and all that sort of thing. But he pulled it out mechanically, felt the prick of a pin and then gave an odd little scream, like a shot rabbit. Next (excuse him!) he rapped out a frightful oath. "My God!" cried the aged blasphemer. No less. But the violence of his emotion must have shaken his standards. He stood there, with the emerald in the palm of his right hand, staring at it, distraught. And once more in his bewilderment he fell to repeating the name of his Creator--upon whose existence indeed, he had more than once learnedly discoursed, concluding upon the whole against it. It is said that under the strain of very severe emotion men do things unnatural, out of themselves. And behold! Professor William de Bohun behaved for the next half hour like a whole group of characters, any one of whom you would have said he could not have thrown himself into for the world. Terror inspired him, and the tragic sense of impending doom. It must be got rid of! He had a mad impulse to swallow it. Luckily he restrained it in time: it was too big, its metal fastenings too angular for health; and then, there was the pin.