Frémont's experiences during his surveys of the great valleys of the San Joaquin and Sacramento caused him to fall under the fascinating spell which California exercises over the greater number of its Eastern settlers. The vast domain of its virgin forests, the luxuriance of its vegetation, the extent and fertility of its valley lands, and its incomparable climate were speedily recognized by Frémont as so many physical conditions calculated to insure unparalleled prosperity when once it should be occupied by Americans. He saw this vast region practically a waste; its magnificent harbors unvexed, unbroken by the keels of commerce; its unrivalled valleys awaiting the hand of intelligent labor to transform them from mere pastures for scattered herds of cattle into fruitful granaries, orchards, and vineyards capable of feeding a continent. Imbued with these ideas he cast in his lot with California, and was a potent power in making it a free State, and was honored by election as its first Senator, unfortunately, however, drawing the short term in the United States Senate. Failing, through the defeat of his party, of re-election, Frémont visited Europe for a brief and well-earned rest, which was broken by the authorization of Congress for a survey of a trans-continental railway, which awoke his dormant exploring spirit. Returning promptly to the United States he organized an expedition under private auspices, which started westward in September, 1853. He travelled by the central route through the mountains of Colorado, passing over the Sierra Blanca, through the Sandy Hill Pass and the valley of the Grand River. Turning southward into Utah and crossing the Sawatch Mountains, Frémont's march brought him to the Sierra Nevada near the end of winter, and their passage was attempted near the thirty-seventh parallel. Thereof he writes: "I was prepared to find the Sierra here broad, rugged, and blocked with snow, and was not disappointed in my expectations." The snow being impassable and food failing he made a detour of some seventy miles to the southward and reached the Kern River Valley through Walker Pass. The march entailed endless suffering and extreme privations on the party, which was pushed to the direst extremities to preserve life. They were often without food of any kind for an entire day and for many weeks had only the flesh of their emaciated and exhausted horses. The disastrous outcome of this expedition impaired Frémont's reputation, it appearing, then as now, surprising that, aware by bitter experience of the impracticability of such a journey, he should have so timed his march as to be again overwhelmed by the dreadful winter snow of the Nevada range.