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Surely the cerealia and leguminous plants which we cultivate must derive their carbon and nitrogen from the same source whence the graminea and leguminous plants of the meadows obtain them! No doubt can be entertained of their capability to do so. In Virginia, upon the lowest calculation, 22 pounds weight of nitrogen were taken on the average, yearly, from every morgen of the wheat-fields.
This is the Vallisneria spiralis, a remarkable plant, which may be also met with in Southern Europe, especially in the Canal of Languedoc, and regarding the fructification of which different opinions prevail." "Nearer to the land, we observe similar grass-like leaves, but with little yellow stellated flowers: these belong to the order of Schollera graminea.
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