2. _Medicago sativa_—Lucerne—is a perfectly perennial plant, which, though not so much grown in England as it deserves, yet scarcely needs description; however, its purple flowers and smooth twisted seed-pods serve to distinguish it from the rest of the genus. We have grown this plant upwards of a foot high by the 1st of May, and taken no less than three cuttings of a good succulent herbage in one season. These qualities point out lucerne as an excellent green-food plant, for which purpose we should always, where practicable, recommend that at least a patch should be grown near the stable, as there is reason to believe that its alterative effects upon the horses are of a most salutary kind. It should be cultivated in drills of from 15 to 18 inches apart; and, if properly weeded and not let get too old before cutting, it will last for many years with an occasional dressing of manure. We once had a patch one half of which was purposely neglected by way of comparison with the other half, which was well cared for; that portion left to itself yielded but poor crops, and almost disappeared at the end of four years, whilst the other portion scarcely began to decline after ten years. This remark applies with full force to all the green-food crops of this order. Weeding early, mowing when cut, and an occasional top-dressing, would increase the durability of all the perennial species. V. MELILOTUS—_Melilot_. These are pea-flowered plants, with ternate leaves, and spikes of flowers drooping to one side: it is named from _mel_, honey, in allusion to its flavour, and the genus _Lotus_, by which we may understand it to be a sweet-scented lotus-like plant. We have two native species, distinguished thus:— _Melilotus officinalis_, an annual, with yellow flowers. _M. leucantha_, a biennial, with white flowers. Of these we may conclude that the flavour, which is like that of the _Anthoxanthum odoratum_—sweet vernal grass—is too strong and bitter to allow of its being recommended for culture alone; but we are inclined to think that, if grown in small quantity with seeds, or if a separate patch be cut and arranged sandwich-wise in the seed-rick, the melilots would give that sweet flavour which seems to be the principal cause of the superior qualities and sweetness of natural meadow as compared with artificial grasses.