Twain's Letters vol 2 1867-1875
The Cooper Union lecture proved a failure, and a success. When it became evident to Fuller that the venture was not going to pay, he sent out a flood of complimentaries to the school-teachers of New York City and the surrounding districts. No one seems to have declined them. Clemens lectured to a jammed house and acquired much reputation. Lecture proposals came from several directions, but he could not accept them now. He wrote home that he was eighteen Alta letters behind and had refused everything. Thos. Nast, the cartoonist, then in his first fame, propped a joint tour, Clemens to lecture while he, Nast, would illustrate with "lightning" sketches; but even this could not be considered now. In a little while he would sail, and the days were overfull. A letter written a week before he sailed is full of the hurry and strain of these last days.
To Mrs. Jane Clemens and family, in St. Louis: