Watt’s presence being much wanted in Cornwall, he again proceeded thither, accompanied by his wife and family, and arrived at Cosgarne towards the end of June, 1781. He found that many things had gone wrong for want of the master’s eye, and it was some time before he succeeded in putting affairs in order. The men had been neglecting their work, “going a-drinking.” Cartwright had “contracted a fever in his working arm, and been swallowing ale for a cure,” until he heard Watt had come, when the fever left him. Mrs. Watt also found occasion to complain of sundry little grievances, and favoured Boulton with a long catalogue of them. Gregory and Jessy had caught cold on the journey, and workmen were hammering about the house making repairs. There was, however, one gleam of brightness in her letter: “James’s spirits were surprisingly mended since his arrival.” Watt was a most voluminous correspondent. He wrote Boulton several times a week great folio sheets, written close, in small hand. The letters must have occupied much of his time to write, and of Boulton’s to read. The latter, seeing his partner’s tendency to indulge in “worrit” about petty troubles, advised him in a kindly spirit not to vex himself so much about such matters, but to call philosophy to his aid. Why should he not occupy some of his spare time in writing out a history of all his steam-engine contrivances, to be dedicated to Sir Joseph Banks, and published in the ‘Transactions of the Royal Society’? But Watt was extremely averse to writing anything for publication, and the suggestion was not acted on. Then, knowing Watt’s greatest pleasure to be in inventing, Boulton in a subsequent letter advised him to take up afresh, and complete a plan which they had often discussed, of producing rotary motion, by which the engine might be applied to work mills and drive machinery.