With the writing of the second of the series, Cooper concluded the opening period in his authorship. In a little over six years he had published six novels and had shown promise of all that he was to accomplish in later life. He had attempted four kinds: stories of frontier life in which he was always successful; sea tales, for which he was peculiarly fitted; historical novels, which he did indifferently well; and studies in social life, in which he had started his career with a failure but to which he returned again and again like a moth to the flame. To "The Last of the Mohicans" the verdict of time has awarded first place in the long roster of his works. It is the one book written by Cooper that is devoted most completely to the vanishing race. Three passages set and hold the key to the story. The first is from the author's introduction: "Of all the tribes named in these pages, there exist only a few half-civilized beings of the Oneidas on the reservation of their people in New York. The rest have disappeared, either from the regions in which their fathers dwelt, or altogether from the earth." The second is a speech from Chingachgook to Hawkeye in the third chapter, where they are first introduced: "Where are the blossoms of these summers?--fallen, one by one: so all of my family departed, each in his turn, to the land of the spirits. I am on the hilltop, and must go down into the valley; and when Uncas follows in my footsteps, there will no longer be any of the blood of the Sagamores, for my boy is the last of the Mohicans." The third is the last speech of the book, by the sage Tamenund: "It is enough," he said. "Go, children of the Lenape, the anger of the Manitou is not done. Why should Tamenund stay? The pale-faces are masters of the earth, and the time of the red-men has not yet come again. My day has been too long. In the morning I saw the sons of Unamis happy and strong; and yet, before the night has come, have I lived to see the last warrior of the wise race of the Mohicans."