The doorway of the northern arm of the transept, also known as the door of St. Firmin the Confessor, is of the same construction as that of the southern arm, but is unadorned with sculpture. The dividing pillar alone is ornamented with a 13th century statue of a bishop. In the tympanum is a glazed, packed wall which dates from the beginning of the 14th century; the nerves represent an enormous spider. The upper portion is unfinished; the rose window is bare of any [Illustration: STATUES ON NORTH TOWER BUTTRESS: (_on left_) CHARLES V. (_on right_) THE DAUPHIN.] ornamentation, and there is no stone gable. As in the case of the south façade, the chapels of the nave are separated on the outside by buttresses ornamented with 14th century statues. The two chapels nearest the principal façade were the last to be built (1373-1375), and it was Jean de la Grange, then Bishop of Amiens, and afterwards Cardinal and Financial Comptroller to Charles V., who bore the expense of the building. A massive buttress was built to strengthen the north tower, which these later constructions had weakened. Two of the sides of the buttress and the dividing pillar between the two chapels are ornamented with three superposed statues of considerable interest, both from an historical and artistic point of view. Considered downwards they represent: On the north side of the buttress: _St. John the Baptist_, _the Dauphin Charles_ (_later Charles VI.--photo above_) and _Bureau de la Rivière_, Counsellor to Charles V. and VI. On the west side of the buttress: _The Virgin_, _King Charles V._ (_photo above_), and _Cardinal Jean de la Grange_. On the dividing pillar between the two chapels: _St. Firmin the Confessor_, _Louis of Orleans_ (_second son of Charles V._) _and a Counsellor of the King_. Flying Buttresses (_photo opposite_) The flying buttresses of the nave are characteristic of the great Gothic period. Built of massive masonry, each consists of two superposed arches, one above and the other below the point of abutment of the ogival arches of the great nave. These flying buttresses provide a counter-thrust which partly annuls that of the vault. The remainder is taken by the massive buttresses surmounted by pinnacles and turrets, the latter preventing them from giving way under the continual thrust of the flying-buttresses. [Illustration: FLYING BUTTRESSES OF NAVE WITH TWO SUPERPOSED ARCHES (_Cliché LL._)] [Illustration: PLAN OF CATHEDRAL. NORTH DOORWAY GREAT DOORWAY ST. CHRISTOPHER'S DOOR SOUTH DOORWAY (Gilded Virgin)] KEY TO PLAN OF AMIENS CATHEDRAL