Some day when it is difficult to find a text, one need only turn to the notebook and find one there already suggestively outlined. He should jot down important thoughts as they come to him, making a note not merely of the reference to the page or location, but working out the headings with the thoughts that suggest themselves to him at the time. The outline should be worked out there and then. At some future time when he feels barren, he may draw on this fresh manna. In this way he will have a constant