last-named species; but this is not to be relied upon as a
distinguishing characteristic, as the size of the seeds, in this as in
most other plants, is liable to be materially altered by the soil as
well as by the previous culture of the seed-stock.

The seeds are sown in summer, and the crop ripens the following year. It
is not adapted to the climate of the Northern States.

In England, the foregoing species are extensively cultivated both for
forage and for seed; the latter being used to a limited extent for
feeding birds, but chiefly for the production of rape-seed oil.

GERMAN RAPE. _Law._

Annual or Early Rape. Smooth-leaved Summer Rape. Brassica praecox.

The German Rape somewhat resembles the Common or Winter. It differs in
being of annual duration; in its more deeply divided leaves, more erect
pods, and smaller seeds.

It would unquestionably succeed well in almost any part of the Northern
or Middle States, and might prove as remunerative a crop as corn or
wheat. The seeds should be sown in May; and the plants should be treated
and the crop harvested, in all respects, as Mustard. It is sometimes
sown broadcast, but generally in drills. When sown broadcast, eight or
ten pounds of seed will be required for an acre; if in drills, three or
four pounds will be sufficient. The yield varies from twenty to forty
bushels per acre.

SUMMER RAPE. _Law._

Colza. Wild Navew. Brassica campestris.

A biennial plant, with a tapering, hard, and fibrous root. The radical
leaves are lyrate and roughish when young; those of the stem clasping,
or heart-shaped, at base, and of an oblong form,--all somewhat fleshy,
of a dark-green color, with a glaucous bloom. The seeds are larger than
those of the Ruta-baga, or Swedish Turnip, but in other respects not
distinguishable.

This species is sometimes termed _Brassica campestris olifer_, or
Oil-rape, from its being considered the best sort of rape for
cultivating for oil; and to distinguish it from the _Campestris
Ruta-baga_, or Swedish Turnip, which is only a variety of this species.

It is not sufficiently hardy for cultivation in the Northern States.

* * * * *

ROCKET. _Vil._

Garden Rocket. Roquette, of the French. Brassica eruca.

A hardy, annual plant, from the south of Europe. Stem about two feet
high; leaves long, lobed or lyrate, smooth and glossy, succulent and
tender; flowers pale citron-yellow, with blackish-purple veins, ver