Perhaps no form of head-dress is more strange than the college cap or mortar-board, or, in technical language, pileus quadratus, or cater cap. This skull-cap, with its curious square top, is not the only kind of academical head-dress. There is the round cap which is especially that of the doctor, while the mortar-board or trencher already mentioned is used by masters and bachelors, as well as by undergraduates and scholars. The former head-dress seems to have been very little altered, and was developed somewhere about the fourteenth century or earlier from the ecclesiastical skull-cap, which was something like an old-fashioned man’s nightcap, with a tuft. The square cap is an undoubted descendant of the ecclesiastical cap of dignity, and in England this also came from the skull-cap already mentioned. Towards the end of the fifteenth century, while still used by ecclesiastics, it began to assume a square or cusped shape. Prof. E. C. Clark[31] agrees with the opinion expressed to him by the late Dr. Littledale, that folds were introduced into the soft material in order to make the cap easier to hold, for by them it was stiffened. The folds became four wings, and so converted the round top into a square. From this it was but a short step to the ecclesiastical biretta of the present day. Any further exaggeration of its top would cause the cap to fall down on the face, and would naturally suggest the insertion of something to stiffen it and hold it out, and in the end the square top of the cap was made of cardboard covered with cloth, and a skull-cap was fixed to it underneath. (See Figure [136].)
Fig. 136.—A college cap or trencher.
Fig. 137.—Cranmer’s hat, illustrating a stage in the evolution of a mortar-board (after Fairholt).
