Flexible sewn books can be had now if wanted, but the sewing on the bands is not quite the same as the fine mediæval double bands I have described. It is, however, practically nearly as good, and the bands themselves can be made smaller. [Illustration: FIG. 30.--Modern sewing round single band.] The modern method is to bring the needle and thread through the back of the section as usual, then give it one turn onwards over the band and back again through the same hole. It will be seen that this is a thoroughly sound principle, and brings no strain upon the back of the section. The ends of the bands of limp vellum books have always been treated in the same way; they are drawn straight through the vellum at the joint and then back again and fastened inside by means of the end paper. The manner of drawing the bands of a “limp” vellum bound book through the limp vellum cover is of much interest, and it survives in many instances where boards are used. In principle it is the same process as is described further on with regard to boarded books, but in the case of the limp vellum bindings the ends of the bands are normally visible for a short length, but in the case of boarded books they are always covered up with the exception of some vellum-covered boarded books in which the limp vellum peculiarity is preserved. Another small point of interest about the old limp vellum bindings is that the head and tail bands are made of the same sort of thin vellum strip as the main bands and carefully drawn diagonally through the vellum at the corners and fastened inside. Dealt with in this way the head band becomes of real structural value, much of which is lost if it is cut off short as is done in the large majority of cases. William Morris liked limp vellum bindings and often used them, but without head bands. Instead of the short strips of vellum used for bands in old books Morris used specially prepared silk tapes, and brought them through the vellum at the joint in the old-fashioned way. Instead of being cut short and pasted down as the old limp vellum bands were, Morris continued his tapes and brought them out again near the front edge of the vellum, where they could be tied. This is an excellent arrangement and keeps such a book together in an admirable and effective way. Vellum bindings required flat backs because the material would not yield sufficiently to be tucked round the projecting bands of a normal flexible bound book, in which the leather back is firmly fixed over the bands. Nevertheless in several instances old vellum books, in boards, which have been sewn on raised bands show traces of these bands in low relief across the back. In such cases it is common to find that some padding has been put in the spaces between the bands so as to level the back up. Books treated in this way are usually stiff to open and uncomfortable to consult.