As soon as they were settled together, and the ladies had decided in their own minds that the girl would lighten their lives, they resolved that Kitty's education must not be neglected, and for this end began to devise such a comprehensive scheme as would have required the staff of a whole university to carry it through. Everything was set down (upon a slate) which it behoved a girl to know. Unfortunately the means at their disposal did not allow of this great scheme. Thus it was fitting that music should be taught: Mrs. Deborah had once been a proficient on the spinnet, but there was no spinnet to be had; the French tongue forms part of polite education, but though both ladies had learned it of old, their memory was defective, and they had neither dictionary nor grammar nor any book in the language; limning, both with pencil and in water-colours, should be taught, but the sisters could neither of them draw, and hardly knew a curve from a straight line. Calligraphy is almost a necessary, but the handwriting of both ladies was tremulous, and of antiquated fashion; they knew not the modern Italian hand. There was in the Rules a professor in the art, and an attempt was made to get lessons from him. But he was already old and hastening to the grave, which speedily closed over him; his hand shook, because he drank strong waters; his coat was stained with beer and punch; his wig smelt always of tobacco. Mrs. Deborah undertook, as a beginning, to teach the girl book-keeping by single and double entry. How or why she ever came to learn this science has never been understood. Yet she knew it, and was proud of it. "It is a science," she said, "which controls the commerce of the world. By its means are we made rich: by the aid of book-keeping we apportion the profit and the loss which are the rewards of the prudent or the punishment of the thriftless. Without book-keeping, my dear, the mysteries and methods of which I am about to impart to you, neither a Whittington, nor a Gresham, nor even a Pimpernel, would have risen to be Lord Mayor of London."