[Q] By Mr. Burgess. The toil and skill necessary to produce a facsimile of this degree of precision will only be recognized by the reader who has had considerable experience of actual work.

[R] The ordinary title-page of Punch.

[S] In the lecture-room, the relative rates of execution were shown; I arrive at this estimate by timing the completion of two small pieces of shade in the two methods.

[T] John Bull, as Sir Oliver Surface, with Sir Peter Teazle and Joseph Surface. It appeared in Punch, early in 1863.

[U] In preparing these passages for the press, I feel perpetual need of qualifications and limitations, for it is impossible to surpass the humor, or precision of expressional touch, in the really golden parts of Tenniel's works; and they may be immortal, as representing what is best in their day.

[V] From Bewick's Æsop's Fables.

[W] See ante, [§ 43].

LECTURE IV.

THE TECHNICS OF METAL ENGRAVING.