1. The disproportion between the length of time occupied in the preparation of this volume, and the slightness of apparent result, is so vexatious to me, and must seem so strange to the reader, that he will perhaps bear with my stating some of the matters which have employed or interrupted me between 1855 and 1860. I needed rest after finishing the fourth volume, and did little in the following summer. The winter of 1856 was spent in writing the Elements of Drawing, for which I thought there was immediate need; and in examining with more attention than they deserved, some of the modern theories of political economy, to which there was necessarily reference in my addresses at Manchester. The Manchester Exhibition then gave me some work, chiefly in its magnificent Reynolds' constellation; and thence I went on into Scotland, to look at Dunblane and Jedburgh, and some other favourite sites of Turner's; which I had not all seen, when I received notice from Mr. Wornum that he had obtained for me permission, from the Trustees of the National Gallery, to arrange, as I thought best, the Turner drawings belonging to the nation; on which I returned to London immediately.

2. In seven tin boxes in the lower room of the National Gallery I found upwards of nineteen thousand pieces of paper, drawn upon by Turner in one way or another.