The next characteristic of a book to be noted through the sense of touch is the _texture_ of the paper. By "texture" several things are meant: a surface agreeable to the hand, the degree of crispness, an impression of toughness (again the evidence of durability), and the degree of flexibility. Ideally, the paper in a book should satisfy all these requirements and should possess as well certain qualities of character, style, and color, pleasing to the informed eye. These will be dealt with in their proper place. The paper should be flexible, without the flimsiness characteristic of papers weak in substance. It should bend readily when the leaves are turned and should flow smoothly through the hand when all the leaves are bent at once. Stiffness in the leaves of a book (an all too common defect) is not, it should be observed, always the fault of the paper. It is often due to the choice of a paper too heavy for the size of the leaf. The same paper in a larger leaf might have the desired flexibility.
The final tactile test of a fine book (applicable, alas, to very few books indeed) resides in the character of the impression of the type on the paper. In the best printing, the surface of the page, if rubbed with the palm of the hand, shows a slight and pleasant roughness due to the sinking of the type into the paper. Such printing is rare in modern books because it is difficult of attainment with machines designed for quantity production. To attain the effect described the paper should be dampened before printing, and an ink employed that is adaptable only to the hand press. Dry paper, particularly when heavily sized, resists a deep impression. It can be _heavily_ impressed, but there is not the same difference between the impressed and unimpressed portions, due to the impaction of the substance caused by the pressure of the type, which results when dampened paper is used. In the latter instance, the depth of impression is _within_ the sheet, not an embossment on the reverse side. This incisiveness, without a corresponding relief on the back of the sheet, is shown when an impression without ink is made on a hand press with dampened paper and a hard packing.
In printing on dry paper it is necessary, if adequate color is to be obtained, to use such a quantity of ink, of a consistency suitable to machine-press printing, that a really deep (not merely heavy) impression cannot be imparted to paper without "spreading," which slightly modifies the sharpness of the type. The machine printer must choose therefore between a surfacy quality with sharpness and a heavy (not necessarily deep) impression with a loss of sharpness, neither of which is ideal. There are some that will question the truth of this statement, calling attention to specimens of machine printing on dry paper in which the ink has been driven into the sheet and perfect sharpness maintained. It may be said, however, in support of our contention, that, under the test of hand and eye, this perfectly printed dry sheet will be found, in the last analysis, to lack, in comparison with a sheet perfectly printed by hand on dampened paper, a certain almost-indefinable something that can perhaps be best described as a _living_ quality. This ultimate grace arises, I think, from the fact that in competent hand-press printing the third dimension is not merely suggested but actual; we have, in other words, not merely sharpness but crispness; the effect attained is sculptural. No printing that is lifeless, or to which such terms as "slick" and "dry" may be appropriately applied can be called fine printing.