Cooper would have been more or less than mortal if the unexpected success achieved by "The Spy" had not incited him to renewed effort. It definitely determined his career, though at the time he did not know it. As yet he was not sure in his own mind whether the favor his book had met was the result of a lucky hit or was due to the display of actual power. There can be no question as to the honesty of his assertion when he published his third novel, that it depended upon certain contingencies whether it would not be the last. But from this time on he wrote incessantly. From 1820 to 1830, including both years, he brought out eleven works. In many respects this was the happiest period of his literary life as well as the most successful. During it he produced many of his greatest creations. One decided failure he made; but with this exception if each new story did not seem to exhibit any new power, it at least gave no sign of weakness, or misdirection of energy. This period is in fact so supremely the creative one of Cooper's life as regards the conception of character and scene that nearly all he did demands careful examination. He first set about a task that lay near his heart. This was to describe the scenes, the manners and customs of his native land, especially of the frontier life in which he had been trained. In 1823, (p. 040) accordingly, appeared "The Pioneers," itself the pioneer of the five famous stories, which now go collectively under the name of the "Leather-Stocking Tales." It was a vivid and faithful picture of the sights he had seen and the men he had met in the home of his childhood, where as a boy he had witnessed the struggles which attend the conquest of man over nature. In it appear in comparatively rude outlines the personages whose names and exploits his pen was afterwards to make famous throughout the civilized world. They are in this work of a far less lofty type than in those which followed. "The Pioneers," in truth, though not a poor story, is much the poorest of the series of which it forms a part. The almost loving interest he took in the matter about which he was writing tempted the author to indulge his recollections at the expense of his judgment. His first novel, he said in the prefatory address to the publisher which appeared in this one, had been written to show that he could write a grave tale, and it was so grave that no one would read it; the second was written to overcome if possible the neglect of the public; but the third was written exclusively to please himself. The story as a story suffered in consequence from the very fascination which the subject had for his mind. So subordinate was it made, especially in the first half, to the description of the scenes, that the details at times become wearisome and the interest often flags.