Part XII. should contain 2 pp. publishers' advertisements

both at front and back, printed on the buff wrapper paper.

NOTES ON THE PLATES.

(i) No plates were issued with Part IX., but six instead of three with Part X. A slip should be found inserted in Part IX. calling attention to the arrangement. My own set shows a similar happening in the case of Parts VII. and VIII., but there is no sign of a slip having figured in the former to explain the absence of illustration.

(ii) In two cases there are variations in underline between part and book issue: (_a_) One of the plates included in