The great east window is considered to be the finest example of its style in the kingdom. It is of eight lights, "formed by doubling the four-light," and has a great circle in the head, filled with a six-foil surrounded by half-a-dozen quatrefoils. "Bar-tracery being fully developed," we read in a note to Rickman's "Gothic Architecture," "the general appearance of the window is rather Decorated than Early English, but the mouldings still belong to the earlier style." "This window ... together with the whole of that part of the choir is singularly and beautifully accommodated to the style of the rest of the building." The aisle windows are each of three lights, with three circles in the head, two filled with cinquefoils and one with a quatrefoil. The two east windows of the aisles are similar to the others. The wall below the windows is decorated all round with arcading of a richer design than that in the nave. Two trefoiled arches are included in a larger arch, with a quatrefoil within a circle filling the head. The spandrels have sunk trefoils. The bosses of the stone vaults to the aisles are carved with sacred subjects, foliage, and grotesque figures. [Illustration: EAST END OF THE ANGEL CHOIR. _S. B. Bolas & Co., Photo._] The sculptured angels, from which this part of the minster derives its name, fill the spandrels of the triforium, occupying a length of 118 feet on each side. It has been suggested that the idea may have been taken from the angels in St. Hugh's double wall-arcading, remains of which are still seen in different parts. The whole series has been fully illustrated, and exhaustively described and interpreted by Professor C. R. Cockerell, in the Lincoln volume (1848) of the Archæological Institute. Two hands of different merit are recognised by him in the work; he considers Nos. 4 to 18 (counting round from the south-east corner) to be amongst the best. The others are of inferior execution, though often of excellent design. They were carved before being placed in their present positions, as is evident from No. 11, the joints of which are not perfectly adjusted, and they are of the same stone as was employed in the architecture of the cathedral. Could it have been Richard of Stow or Gainsborough, the _cementarius_, who was employed to execute these sculptures? [Illustration: The Lincoln Imp. Drawn by H. P. Clifford.]