. Un manuel de mauvaises herbes : avec des descriptions de tous les plus pernicieux et problématiques des usines aux États-Unis et au Canada, leurs habitudes de croissance et de distribution, avec des méthodes de contrôle . Les mauvaises herbes. {LEGUMINOSAE) FAMILLE D'IMPULSIONS 233 sol "rénovateurs", en partie en raison de leur grande et racines pénétrant profondément, qui briser le sol, moelleux, aérez, et l'égoutter, puis, par leur mort et décomposition rapide, celle-ci à l'humus ; ils portent également sur leurs racines tubercules nombreux dans lesquels vivent ces bienfaisant, de collecte d'azote bactéries que faire de la terre pour mieux leur ayant vécu en elle.

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. A manual of weeds : with descriptions of all the most pernicious and troublesome plants in the United States and Canada, their habits of growth and distribution, with methods of control . Weeds. LEGUMINOSAE {PULSE FAMILY) 233 "soil renovators, " partly by reason of their large and deeply penetrating roots, which break up the soil, mellow, aerate, and drain it, and then, by their death and rapid decay, furnish it with humus; also they bear on their roots many tubercles in which live those beneficent, nitrogen-gathering bacteria that make the earth better for their having lived in it. For this reason, Sweet-clover is often used to prepare the ground for the growing of Alfalfa. The hay is nutritious, but cattle do not like its strong odor and will not eat it until they have been "educated to the taste, " which is usually done by turning them into the Sweet-clover field early in spring, when no other green forage is available. (Fig. 165.) Stems three to ten feet tall, round, slender, somewhat woody, many-branched, smooth except the young growing twigs, which are finely hairy. Leaves pinnately three-foliolate, the leaflets oblong to elliptic, obtuse or some- times even notched at the tip, very finely toothed, the foot-stalk of the middle one bent slightly upward ; petioles usually shorter than the blades. Flowers in long, slender, one-sided, axillary racemes, white and very fragrant; corolla about a quarter-inch long, with narrow petals, the standard longer than the wings or the keel. Pods ovoid, wrinkled, net-veined, one- or two-seeded. When in the soil the seeds are said to retain their vitality for fifty years or more; they are sometimes used by unscrupulous dealers for the adulter- ation of Alfalfa seed, which is somewhat similar in appearance but much more expensive. Means of control Close cutting as soon as the first flowers open; the plants will immediately sprout thick stools of flowering stalks, requiring a second and perhaps a third cutting,

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