It was in Nevada and California that Mark Twain's humor, of which we have evidences during the whole of his adolescence, came to the front; and it is a notable fact that almost every man of a literary tendency who was brought into contact with those pioneer conditions became a humorist. The "funny man" was one of the outstanding pioneer types; he was, indeed, virtually the sole representative of the Republic of Letters in the old West. Artemus Ward, Orpheus C. Ker, Petroleum V. Nasby, Dan de Quille, Captain Jack Downing, even Bret Harte, sufficiently remind us of this fact. Plainly, pioneer life had a sort of chemical effect on the creative mind, instantly giving it a humorous cast. Plainly, also the humorist was a type that pioneer society required in order to maintain its psychic equilibrium. Mr. Paine seems to have divined this in his description of Western humor. "It is a distinct product," he says. "It grew out of a distinct condition--the battle with the frontier. The fight was so desperate, to take it seriously was to surrender. Women laughed that they might not weep; men, when they could no longer swear. 'Western humor' was the result. It is the freshest, wildest humor in the world, but there is tragedy behind it." Perhaps we can best surprise the secret of this humor by noting Mark Twain's instinctive reaction to the life in Nevada. It is evident that in many ways, and in spite of his high spirits and high hopes, he found that life profoundly repugnant to him: he constantly confesses in his diary and letters, indeed, to the misery it involves. "I do _hate_ to go back to the Washoe," he writes, after a few weeks of respite from mining. "We fag ourselves completely out every day." He describes Nevada as a place where the devil would feel homesick: "I heard a gentleman say, the other day, that it was the 'd----dest country under the sun'--and that comprehensive conception I fully subscribe to. It never rains here, and the dew never falls. No flowers grow here, and no green thing gladdens the eye.... Our city lies in the midst of a desert of the purest--most unadulterated and uncompromising--_sand_." And as with the setting--so with the life. "High-strung and neurotic," says Mr. Paine, "the strain of newspaper work and the tumult of the Comstock had told on him": more than once he found it necessary--this young man of twenty-eight--"to drop all work and rest for a time at Steamboat Springs, a place near Virginia City, where there were boiling springs and steaming fissures in the mountain-side, and a comfortable hotel." That he found the pace in California just as difficult we have his own testimony; with what fervor he speaks of the "d----n San Francisco style of wearing out life," the "careworn or eager, anxious faces" that made his brief escape to the Sandwich Islands--"God, what a contrast with California and the Washoe"!--ever sweet and blessed in his memory. Never, in short, was a man more rasped by any social situation than was