Audubon spent four days with Swainson and his family at Tyttenhanger, from May 28 to June 1, 1828, when they talked birds and made drawings; Audubon also showed Swainson "how to put up birds in _his_ style, which delighted him." The friendship between these men, though very intimate while it lasted, received a sudden check two years later, when Audubon was about to publish the letterpress to his plates, as will be related farther on.[357] Though his hands were already more than full at this time, Audubon seems to have played with the idea of publishing a work on the birds of Great Britain, but on May 1 he wrote to Swainson that the plan did not meet with favor, and later he relinquished all claims in such a project to his assistant, William MacGillivray.[358] In the spring of 1828 Audubon began to think of returning to the United States, to renew or revise his drawings and extend his researches. "I am sure," he said, "that now I could make better compositions, and select better plants than when I drew mainly for amusement." In order to raise the necessary funds, he resorted again to picture painting, his never failing resource, and worked in oil colors daily from morning light until dusk, unless called to Havell's to decide some question of necessary detail. The following letters to Swainson shed further light on this work and on the progress of _The Birds of America_, the eighth number of which was published early in July: _Audubon to William Swainson_ LONDON, _July 1st 1828_. MY DEAR SIR.—