“The fruiterer! — you astonish me — I know no fruiterer whomsoever.”

“The man who ran up against you as we entered the street — it may have been fifteen minutes ago.”

I now remembered that, in fact, a fruiterer, carrying upon his head a large basket of apples, had nearly thrown me down, by accident, as we passed from the Rue C ——­ into the thoroughfare where we stood; but what this had to do with Chantilly I could not possibly understand.

There was not a particle of charlâtanerie about Dupin.  “I will explain,” he said, “and that you may comprehend all clearly, we will first retrace the course of your meditations, from the moment in which I spoke to you until that of the rencontre with the fruiterer in question.  The larger links of the chain run thus — Chantilly, Orion, Dr. Nichols, Epicurus, Stereotomy, the street stones, the fruiterer.”

There are few persons who have not, at some period of their lives, amused themselves in retracing the steps by which particular conclusions of their own minds have been attained.  The occupation is often full of interest and he who attempts it for the first time is astonished by the apparently illimitable distance and incoherence between the starting-point and the goal.  What, then, must have been my amazement when I heard the Frenchman speak what he had just spoken, and when I could not help acknowledging that he had spoken the truth.  He continued: 

“We had been talking of horses, if I remember aright, just before leaving the Rue C ——­ .  This was the last subject we discussed.  As we crossed into this street, a fruiterer, with a large basket upon his head, brushing quickly past us, thrust you upon a pile of paving stones collected at a spot where the causeway is undergoing repair.  You stepped upon one of the loose fragments, slipped, slightly strained your ankle, appeared vexed or sulky, muttered a few words, turned to look at the pile, and then proceeded in silence.  I was not particularly attentive to what you did; but observation has become with me, of late, a species of necessity.

“You kept your eyes upon the ground — glancing, with a petulant expression, at the holes and ruts in the pavement, (so that I saw you were still thinking of the stones,) until we reached the little alley called Lamartine, which has been paved, by way of experiment, with the overlapping and riveted blocks.  Here your countenance brightened up, and, perceiving your lips move, I could not doubt that you murmured the word ‘stereotomy,’ a term very affectedly applied to this species of pavement.  I knew that you could not say to yourself ‘stereotomy’ without being brought to think of atomies, and thus of the theories of Epicurus; and since, when we discussed this subject not very long ago, I mentioned to you how singularly, yet with how little notice, the vague guesses of that noble Greek had met with confirmation in the late nebular cosmogony, I felt that you could