§ 10. To show how the principle of balance is carried out by Nature herself, here is a little terminal upright spray of willow, the most graceful of English trees (Fig. 59). I have drawn it carefully; and if the reader will study its curves, or, better, trace and pencil them with a perfectly fine point, he will feel, I think, without difficulty, their finished relation to the leaves they sustain. Then if we turn suddenly to a piece of Dutch branch-drawing (Fig. 60), facsimiled from No. 160, Dulwich Gallery (Berghem), he will understand, I believe, also the qualities of that, without comment of mine. It is of course not so dark in the original, being drawn with the chance dashes of a brush loaded with brown, but the contours are absolutely as in the woodcut. This Dutch design is a very characteristic example of two faults in tree-drawing; namely, the loss not only of grace and spring, but of woodiness. A branch is not elastic as steel is, neither as a carter's whip is. It is a combination, wholly peculiar, of elasticity with half-dead and sapless stubbornness, and of continuous curve with pauses of knottiness, every bough having its blunted, affronted, fatigued, or repentant moments of existence, and mingling crabbed rugosities and fretful changes of mind with the main tendencies of its growth. The piece of pollard willow opposite (Fig. 61), facsimiled from Turner's etching of "Young Anglers," in the Liber Studiorum, has all these characters in perfectness, and may serve for sufficient study of them. It is impossible to explain in what the expression of the woody strength consists, unless it be felt. One very obvious condition is the excessive fineness of curvature, approximating continually to a straight line. In order to get a piece of branch curvature given as accurately as I could by an unprejudiced person, I set one of my pupils at the Working Men's College (a joiner by trade) to draw, last spring, a lilac branch of its real size, as it grew, before it budded. It was about six feet long, and before he could get it quite right, the buds came out and interrupted him; but the fragment he got drawn is engraved in flat profile, in Plate 58. It has suffered much by reduction, one or two of its finest curves having become lost in the mere thickness of the lines. Nevertheless, if the reader will compare it carefully with the Dutch work, it will teach him something about trees.