About the year 1814 the system of printing books from stereotype plates began to be very generally adopted for large editions, and Kelly at once saw its advantages, but, of course, as in all improvements, the trade set themselves against the innovation, and he had to purchase land at Merton, and erect a foundry of his own, and then, and not till then, the printers relinquished their opposition, and the building was abandoned. It was about this time, in March, 1815, that he very nearly lost a moiety of his fortune through fire. Luckily, upon the outbreak of a fire in the neighbourhood a few days before, he had been alarmed, and had gone straightway to the office of the Phœnix Company, and paid a deposit on the insurance. Before the policy was made out, the whole of his stock was destroyed, but the Phœnix Company paid up without an hour’s delay, and, in return, he never cancelled a single policy with them until this sum had been reimbursed. How largely Kelly traded may be gathered from the fact that from one of his agents alone he often received from £4000 to £5000 per annum. To revert for a moment to his private life; his father had died in 1810, when the bookseller was still a struggling man, but, in spite of his difficulties, he paid at once the amount of his father’s debts; and brought his mother up to Wimbledon, where she lived to see her son a wealthy and prosperous man. To his old master’s widow he generously allowed an annuity, and even aided young Hogg, who had pursued him with inveterate hatred, with the loan of £600. He never married. When little known he saved a member of the Court of Aldermen from bankruptcy by an advance of £4000, and he was always ready to lend out his money to those in trouble. But once, when asked to give his acceptance to ten or twelve thousand pounds worth of bills--in these terms, “Will you, for once in your life, do a good action, and oblige me?”--he thought himself perfectly justified in refusing, and soon after the acceptor of these bills failed. In 1823 he was elected into the Common Council of his ward; in 1825 he served as Sheriff with Mr. Alderman Crowder, on whose death he succeeded to the Alderman’s gown of Farringdon Without. He always lamented his want of a systematic education, and late in life he endeavoured, in some way, to supply the place of it by experience gathered from foreign travel.