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DUNDONALD CASTLE 173 SECOND PERIOD ornamental, and not constructional, like those of a truly groined vault. Here the ribs are merely applied to the surface of the barrel vault (which does not require their aid), while in a properly groined vault the ribs bear FIG. 139. Dundonald Castle. View in Great Hall, restored. the weight of the filling in of the vault's surfaces between the ribs. The method adopted at Dundonald was often followed in the vaulting of Scotch churches, as for example at St. Giles', Edinburgh, Paisley Abbey, etc., being easier of construction than true groined vaulting. The re-
