APPENDIX II.
REFERENCES EXPLANATORY OF THE PHOTOGRAPHS ILLUSTRATING CHAPTER IV.
The quatrefoils on the foundation of the west front of Amiens Cathedral, described in the course of the fourth chapter, had never been engraved or photographed in any form accessible to the public until last year, when I commissioned M. Kaltenbacher (6, Passage du Commerce), who had photographed them for M. Viollet le Duc, to obtain negatives of the entire series, with the central pedestal of the Christ.
The proofs are entirely satisfactory to me, and extremely honourable to M. Kaltenbacher's skill: and it is impossible to obtain any more instructive and interesting, in exposition of the manner of central thirteenth-century sculpture.
I directed their setting so that the entire succession of the quatrefoils might be included in eighteen plates; the front and two sides of the pedestal raise their number to twenty-one: the whole, unmounted, sold by my agent Mr. Ward (the negatives being my own property) for four guineas; or separately, each five shillings.
Besides these of my own, I have chosen four general views of the cathedral from M. Kaltenbacher's formerly-taken negatives, which, together with the first-named
