standing in a mountain
stream, not in the published series; and next to it, are the
unpublished etchings of the Via Mala and Crowhurst. Turner seems to
have been so fond of these plates that he kept retouching and
finishing them, and never made up his mind to let them go. The Via
Mala is certainly, in the state in which Turner left it, the finest
of the whole series: its etching is, as I said, the best after that
of the aqueduct. Figure 20, above, is part of another fine
unpublished etching, "Windsor, from Salt Hill." Of the published
etchings, the finest are the Ben Arthur, Aesacus, Cephalus, and Stone
Pines, with the Girl washing at a Cistern; the three latter are the
more generally instructive. Hindhead Hill, Isis, Jason, and Morpeth,
are also very desirable.

[26] You will find more notice of this point in the account of
Harding's tree-drawing, a little farther on.

[27] The impressions vary so much in color that no brown can be
specified.

[28] You had better get such a photograph, even though you have a
Liber print as well.

[29] See the closing letter in this volume.

[30] [In 1857.]

[31] If you are not acquainted with Harding's works, (an unlikely
supposition, considering their popularity,) and cannot meet with the
one in question, the diagrams given here will enable you to
understand all that is needful for our purposes.

[32] I draw this figure (a young shoot of oak) in outline only, it
being impossible to express the refinements of shade in distant
foliage in a wood-cut.

[33] His lithographic sketches, those for instance in the Park and
the Forest, and his various lessons on foliage, possess greater
merit than the more ambitious engravings in his Principles and
Practice of Art. There are many useful remarks, however, dispersed
through this latter work.

[34] On this law you do well, if you can get access to it, to look
at the fourth chapter of the fourth volume of Modern Painters.

[35] See Note 3 in Appendix I.

[36] The student may hardly at first believe that the perspective of
buildings is of little consequence; but he will find it so
ultimately. See the remarks on this point in the Preface.

[37] See Note 4 in Appendix I.

[38] See Note 5 in Appendix I.

[39] It is a useful piece of study to dissolve some Prussian blue in
water, so as to make th