A tower is generally erected, or intended, over the crossing, and is carried on the four walls, which, as we have seen, were generally built in this position, in order to stop the four barrel vaults of the different divisions of the church. The towers are somewhat stunted, and they are usually finished with short, stunted spires, having a number of lucarnes, or small dormer windows, inserted in them. The latter feature was probably imported from France or the Low Countries, where similar dormers abound in late work. Monuments are of more common occurrence than in the earlier periods. They are frequently placed in arched and canopied recesses, which are ornamented with crocketed labels and finials. The carving of the crockets and other foliage is, doubtless, founded on the conventional perpendicular foliage of England. This, however, is mixed with a considerable revival of carving, copied from older work. The introduction of numerous small figures of men and animals is a peculiarity of the period generally, and is found both at home and abroad. Much of the carving of Rosslyn Church is of this description, and similar carving may be seen at Melrose Abbey and Stirling Castle, and on the rood screens in Glasgow Cathedral and Lincluden College. Elaborate figure carving is common in other countries at this period, as at Henry VII.’s Chapel, Westminster, and in the churches of France and Spain. Richly carved sacrament houses, such as are occasionally introduced, are a further indication of the taste for minute sculpture which prevailed at this time. It is not unusual to find in late buildings that some of the smaller features, such as sedilias, piscinas, and heraldic work, are well designed and carved with much spirit. Perhaps some of this good carving may be due to the French masons who, we know, were numerous in Scotland during the reigns of James IV. and especially of James V.[6] During the period now under consideration, the structures chiefly erected were, as already mentioned, either parish or collegiate churches. A considerable number of the latter were built and endowed by private founders during the fifteenth and sixteenth centuries. A list of the collegiate churches existing in Scotland at the Reformation is given by Dr. David Laing in his preface to _The Collegiate Churches of Mid-Lothian_.[7] They amounted, according to that list, to thirty-eight in number, and were spread over nearly every county in Scotland. Only two of these had been founded in the fourteenth century, the remaining thirty-six being all founded during the fifteenth century and the first half of the sixteenth century. The structures connected with a considerable number of these college churches are more or less perfectly preserved, and these, as well as several others not mentioned by Dr. Laing, are described in the following pages.