There is no necessity, however, of describing the marks in detail, for, with the exception of two or three American examples, they were all taken from Mr. William Roberts’s _Printers’ Marks_ (London, 1893), in which they are illustrated and explained. Those thought best adapted for decorative effect were chosen throughout, although the marks of as many of the better known printers as possible were included. Occasionally a border or a motto was omitted, but in the main Mr. Roberts’s engravings were pretty exactly copied. In the West Corridor the marks are mostly those of German printers; in the South Corridor, French; in the East Corridor, Italian and Spanish; in the North Corridor, English and Scottish and American.[7] =Mr. Hinton Perry’s Bas-Reliefs.=--Mr. Perry’s bas-reliefs, at the west end of the north and south vaults, have already been referred to. They are four in number, and measure three feet eight inches from one side to another. Taken as a series they represent what may be called, for lack of a better title, _Ancient Prophetic Inspiration_. The chief figure in each is a sibyl or priestess--Greek, Roman, Persian, Scandinavian--in the act of delivering the prophetic warnings which have been revealed to her in the rapture of a divine frenzy. She is regarded as the mouthpiece of the god, and therefore as the fountain of religion, wisdom, literature, art, and success in war--all of which are typified, in one panel or another, in the figures of her auditors. [Illustration: PRINTERS’ MARKS.--CAXTON, TORY, LOTTER.] Beginning in the South Corridor, the first panel shows the Cumæan or Roman Sibyl. She is represented, in accordance with the ancient histories, as an old and withered hag, whose inspiration comes from an infernal, rather than a celestial source. Two figures, as in all the panels, complete Mr. Perry’s group, one male and the other female. The first is clad in the splendid armor of a Roman general; the woman is nude, and stands for Roman Art and Literature. At her feet is a box of manuscripts, and she takes in one hand an end of the long scroll (representing one of the Sibylline Books, so famous in Roman history) which the Priestess holds in her lap. The panel on the other side of the arch represents a Scandinavian Vala or Wise Woman, with streaming hair and a wolf-skin over her head and shoulders. She typifies, in her bold gesture and excited gaze, the barbaric inspiration of the Northern nations. To the left is the figure of a Norse warrior, and to the right a naked woman lies stretched upon the ground, personifying the vigorous life and fecundity of genius of the North.