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Herschel d is a large but shallow ring-plain on the E. of Herschel, with a brilliant but smaller crater on the W. of it. North of Herschel, on a plateau concentric with its outline, stands the large polygonal ring-plain Herschel a, a formation of a very interesting character, with a low broken wall, exhibiting many gaps, and including some craters of a minute class.

Like the other ceilings it is polygonal in section, but unlike all Moorish ones is not returned round the ends. Above a finely carved cornice with elaborate frieze, the whole ceiling is divided into deeply set panels, large and small squares with narrow rectangles between: all alike covered with elaborate carving, as are also the mouldings and the flat surfaces of the dividing bands.

It is a walled-plain, 55 miles in diameter, of a distinctly polygonal type, the N.W. and S.W. sections being practically straight, while the intermediate W. section exhibits a slightly convex curvature, or bulging in towards the interior. There is also much angularity about the E. side, which is evident at an early stage of sunrise.

In the corners of the court polygonal bays, whose surfaces were entirely occupied by buttresses and windows, broke into the squareness of the enclosure; and a far-projecting oriel, springing from a fantastic series of mouldings, overhung the archway of the chief entrance to the house. As Mr. Swancourt had remarked, he had the freedom of the mansion in the absence of its owner.

One year determines success or failure. At the end of that time the child has, in all probability, added one more to the tombstones that crowd the Neo-Therapeutic Cemetery; but on rare occasional a glad procession bears back the little one to his exultant parents, no longer a Polygon, but a Circle, at least by courtesy: and a single instance of so blessed a result induces multitudes of Polygonal parents to submit to similar domestic sacrifice, which have a dissimilar issue.

Stephen looked at the black form of the adjacent house, where it cut a dark polygonal notch out of the sky, and felt that he hated the spot. He did not know many facts of the case, but could not help instinctively associating Elfride's fickleness with the marriage of her father, and their introduction to London society.

This is to be cut away by the defenders in case the enemy gets possession of any portion of the wall; and if the work is quickly done, the enemy will not be able to make his way to the other towers and the rest of the wall unless he is ready to face a fall. The towers themselves must be either round or polygonal.

The circle, or octagon, or other polygonal forms do not appear in the plans of Egyptian buildings; but though all the lines are straight, there is a good deal of irregularity in spacing, walls which face one another are not always parallel, and angles which appear to be right angles very often are not so. The later buildings extend over much space.

You gain much light for the interior, but you cut the exterior to pieces, and instead of a bold rounded or polygonal surface, ready for any kind of decoration, you have a series of dark and damp cells, which no device that I have yet seen has succeeded in decorating in a perfectly satisfactory manner.

The three eastern bays of the nave are separated by buttresses, square below, polygonal above, and ending in round shafts and pinnacles at the top. The cornice, here complete, is deep with its five carved mouldings, but not of great projection. On it stands the cresting of elaborately branched leaves, nearly six feet high.