As for the larger quadruped, Zadig, while walking in a narrow path in the wood, had seen the prints of a horse's shoes, all at an equal distance; and he had said to himself that here was a steed with a perfect stride. The path was narrow, being only seven feet wide, and here and there the dust had been flicked from the trees on either hand, and so Zadig had made sure that the horse had a tail three and a half feet long. The branches crossed over the path at the height of five feet, and as leaves had been broken off, the observer had decided that the horse was just five feet high. As to the bit, this must be of gold, since the horse had rubbed it against a stone, which Zadig had recognized as a touchstone and on which he had assayed the trace of precious metal. And from the marks left by the horse's shoes on another kind of stone Zadig had felt certain that they were made of eleven-penny silver.
Huxley has pointed out that the method of Zadig is the method which has made possible the incessant scientific discovery of the last century. It is the method of Wellington at Assaye, assuming that there must be a ford at a certain place on the river, because there was a village on each side. It is the method of Grant at Vicksburg, examining the knapsacks of the Confederate soldiers slain in a sortie to see if these contained rations, which would show that the garrison was seeking to break out because the place was untenable. It is also the method of Poe in the 'Gold-Bug' and in the 'Murders of the Rue Morgue.' In all probability Poe borrowed it directly from Voltaire, who had taken it over from Oriental folklore.
In his application of this method, not casually, playfully, and with satiric intent, as Voltaire had applied it, but seriously and taking it as the mainspring of his story, Poe added an ingenious improvement of his own devising. Upon the preternaturally acute observer who was to control the machinery of the tale, the American poet bestowed a companion of only an average alertness and keenness; and to this commonplace companion the romancer confided the telling of the story. By this seemingly simple device Poe doubled the effectiveness of his work, because this unobservant and unimaginative narrator of the unraveling of a tangled skein by an observant and imaginative analyst naturally recorded his own admiration and astonishment as the wonder was wrought before his eyes, so that the admiration and astonishment were transmitted directly and suggestively, to the readers of the narrative.
In the 'Gold-Bug' the wonder-worker is Legrand, and in both the 'Murders in the Rue Morgue' and the 'Purloined Letter' he is M. Dupin; and in all three tales the telling of the story is entrusted to an anonymous narrator, serving not only as a sort of Greek chorus to hint to the spectators the emotions they ought to feel, but also as the describer of the personality and peculiarities of Legrand and Dupin, who are thus individualized, humanized, and related to the real world. If they had not been accepted by the narrator as actual beings of flesh and blood, they might otherwise retain the thinness and the dryness of disembodied intelligences working in a vacuum.
This device of the transmitting narrator is indisputably valuable; and, properly enough, it reappears in the one series of detective tales which may be thought by some to rival Poe's. The alluring record of the investigations of Mr. Sherlock Holmes is the work of a certain Dr. Watson, a human being but little more clearly characterized than the anonymous narrators who have preserved for us the memory of Legrand and Dupin. But Poe here again exhibited a more artistic reserve than any of his imitators, in so far as he refrained from the undue laudation of the strange intellectual feats which are the central interest of these three tales. In the 'Gold-Bug' he even heightens his suspense by allowing the narrator to suggest that Legrand might be of unsound mind; and in the 'Murders in the Rue Morgue' the narrator, altho lost in astonishment at the acuteness of Dupin, never permits his admiration to become fulsome; he holds himself in, as tho fearing that overpraise might provoke a denial. Moreover, Poe refrained from all exhibitions of Dupin's skill merely for its own sake—exhibitions only dazzling the spectators and not furthering his immediate purpose.
Nothing could be franker than Sir Conan Doyle's acknowledgment of his indebtedness. "Edgar Allen Poe, who, in his carelessly prodigal fashion, threw out the seeds from which so many of our present forms of literature have sprung, was the father of the detective tale, and covered its limits so completely that I fail to see how his followers can find any fresh ground which they can confidently call their own. For the secret of the thinness and also of the intensity of the detective-story is that the writer is left with only one quality, that of intellectual acuteness, with which to endow his hero. Everything else is outside the picture and weakens the effect. The problem and its solution must form the theme, and the character drawing is limited and subordinate. On this narrow path the writer must walk, and he sees the footmarks of Poe always in front of him. He is happy if he ever finds the means of breaking away and striking out on some little side-track of his own."
The deviser of the adventures of Sherlock Holmes hit on a happy phrase when he declared that "the problem and its solution must form the theme." This principle was violated by Dumas, in the 'Vicomte de Bragelonne,' giving us the solution before the problem, when he showed how d'Artagnan used the method of Zadig to deduce all the details of the duel on horseback, after the author had himself described to us the incidents of that fight. But when he was thus discounting his effect Dumas probably had in mind, not Poe, but Cooper, whose observant redskins he mightily admired and whom he frankly imitated in the 'Mohicans of Paris.'
V
Altho Poe tells these three stories in the first person, as if he was himself only the recorder of the marvelous deeds of another, both Legrand and Dupin are projections of his own personality; they are characters created by him to be endowed with certain of his own qualifications and peculiarities. They were called into being to be possest of the inventive and analytical powers of Poe himself. "To be an artist, first and always, requires a turn for induction and analysis"—so Mr. Stedman has aptly put it; and this turn for induction and analysis Poe had far more obviously than most artists. When he was a student he excelled in mathematics; in all his other tales he displays the same power of logical construction; and he delighted in the exercise of his own acumen, vaunting his ability to translate any cipher that might be sent to him and succeeding in making good his boast. In the criticism of 'Barnaby Rudge,' and again in the explanation of the Maelzel chess-player, Poe used for himself the same faculty of divination, the same power of seizing the one clue needful, however tangled amid other threads, which he had bestowed upon Legrand and Dupin.
If we may exclude the 'Marie Roget' narrative in which Poe was working over an actual case of murder, we find him only three times undertaking the "tale of ratiocination," to use his own term; and in all three stories he was singularly happy in the problem he invented for solution. For each of the three he found a fit theme, wholly different from that employed in either of the others. He adroitly adjusted the proper accessories, and he created an appropriate atmosphere. With no sense of strain, and no awkwardness of manner, he dealt with episodes strange indeed, but so simply treated as to seem natural, at least for the moment. There is no violence of intrigue or conjecture; indeed Poe strives to suggest a background of the commonplace against which his marvels may seem the more marvelous. In none of his stories is Poe's consummate mastery of the narrative art, his ultimate craftsmanship, his certain control of all the devices of the most accomplished story-teller, more evident than in these three.