distinctly striated. There are two kinds of very characteristic hairs found on the elder-leaf, one short and conical, and the other jointed and bulbous. These hairs are more numerous on the upper than on the under surface, and cannot in any case be mistaken for those of tea (Fig. 6).

Willow. The leaves of the common white willow are ellipticallanceolate in form and acute at the apex (Fig. 7)-A, mediumsized leaf; B, the same magnified. The margin of the leaf is

serrated, the lower serratures being somewhat glandular. The cells of the epidermis are much smaller than in tea, and are

not sinuous. The hairs, which are so abundant on both sides of the leaf as to give it a silky appearance, are unicellular, coarse, and very tortuous. They cannot be mistaken for those of

FIG. 8.-SKIN OF THE UPPER (A) AND UNDER (B) SURFACES OF WILLOW

LEAF.

Sloe.-The leaf of the sloe somewhat resembles that of the tea in size and form. Its margin, however, is distinctly serrated,

the serratures being very numerous, coarse, and irregular (Fig. 9) -A, medium-sized leaves; B, leaf magnified.

The cells of the epidermis are not sinuous like those of tea, and are much smaller, especially on the under surface of the leaf. The

stomates are also smaller and less numerous (Fig. 10, B). The cells on the upper surface are striated (Fig. 10, A).

Hairs are found in great abundance on the midrib, the veins, and the margin of the leaf. They are shorter and stouter than those of the tea-leaf, and are somewhat club-shaped at the base.

The serrated edge of the leaf-the striated cells of the upper surface, and the short stout hairs are sufficiently characteristic to distinguish the sloe from the tea leaf.