filter) plates. Some form of orthochromatic plate is
very desirable for interiors, but if a screen has to be
used the exposure becomes unmanageably long. The
woodcuts are reproduced from Bloxam's work.

I have not attempted to make the bibliography
exhaustive, but simply to refer to books likely to be
easily accessible to ordinary readers wishing to pursue
the subject further.

I wish to give sincere thanks to Mr. Bilsonfor
much kind help and criticism; to the Rev. D. H. S.
Cranage; to Mr. G. Jebb, of Boston, Mr. R. P.
Elliott, and Mr. Barrett, for the loan of photographs;
to M. Eugène Viollet-le-Duefor the use of his
father's sketch, and to my old friend and "camarade"
M. Eugène Ewald.

GEORGE HERBERT WEST.

SELSLEV, March 1911.

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