There is a large porch on the north side of the nave (see Fig. 1043), called Halkerston’s Tower, the structure having been at one time much higher than it is now. It was a two storied building, the upper story having evidently been of great height and vaulted, as well as the lower one (see Fig. 1033). Two-storied porches are met with at Aberdeen Cathedral and Linlithgow Church, but they are not so rich in architectural [Illustration: FIG. 1042.--St. John the Baptist’s, Perth. Crossing, looking South.] adornment as this one seems to have been. This sketch is copied from a drawing in the _Memorabilia_, a book seldom to be seen, so that this [Illustration: FIG. 1043.--St. John the Baptist’s, Perth. View from North-West showing New Clerestory, &c.] view is not well known. The circular part of the stair which formerly led to the upper floor, and now leads to a gallery over the north aisle, [Illustration: FIG. 1044.--St. John the Baptist’s. Perth. View, showing West End, &c.] [Illustration: FIG. 1045.--St. John the Baptist’s, Perth. Lower Story of Halkerston’s Tower.] was finished with a conical spirelet like the corresponding feature at Linlithgow, and the top of it is seen in the view. The lower part of the tower, which forms the porch, is very effectively vaulted (Fig. 1045). The round arched doorway leading from the porch to the church partakes of the rudeness already referred to as characteristic of the whole western part of the church. A curious coincidence between a part of this church and of the Cathedrals of Dunblane and Dunkeld, all in the county of Perth, may be referred to. The north-west window of the nave aisle in the three buildings is treated in very much the same way in each edifice, and these windows have all a very decided resemblance to each other, and are quite unlike the other windows in their respective structures. They are all three light windows, and have square heads at Perth and Dunkeld, while at Dunblane the head is practically square, having a very flat segmental arch. The south aisle wall of the nave (Fig. 1046) is a curious medley (which we hope will not be restored). The round arched doorway near the east end is, we presume, original; but it is not easy to tell the new work from the old, as the mouldings of all windows and doors on the outside have received a great amount of patching with cement and paint, owing to the crumbling nature of the stone.