Rhubarb is the root of a plant of the dock kind. From out the sheath of the leaves rises a little bunch of flowers divided into many branches, on which hang four blossoms, surrounded with leaves, and bearing a triangular seed. The roots are long, and rather spungy, tolerably heavy, yellowish on the outside, but within of the colour of a nutmeg, variegated like marble, and of a sharp bitter taste. When eaten they create nausea, and have an aromatic flavour. In divers parts of Paraguay, especially in the mountains called La Cordillera, near the city of Asumpcion, as well as at the banks of the rivers Ỹpane miri, and Tapiraguaỹ, there grows a kind of rhubarb, similar to that of Alexandria in colour, taste, smell, and virtue, but with this difference, that the leaves of the Alexandrine rhubarb are pointed at the bottom, and broader at the end; whereas the leaves of the Paraguayrian are wide at the beginning, and terminate in a point, like the leaves of lilies. I understand that the East Indian rhubarb, as well as that of Persia, Muscovy, and Tartary, is preferred by physicians to that of America. THE ROOT JALAP. Paraguay abounds in the root jalap, the plant of which is called by botanists _Mirabilis Peruviana_. These roots are long, thick, and resinous. Without they are of a dusky brown, but within of a pure white, without any decay. They not only cure bile, and rheum, but expel other noxious humours from the body. The rosin of jalap is prepared from them. MECHOACHÀN. Mechoachàn is a large light root, entirely white at the beginning, but of a dusky colour above. Some call it _bryonia Indica_, but though it resembles the bryonia, its plant is a _convolvulus_, and bears heart-shaped leaves, and small berries. The mechoachàn is well calculated for gently purging infants; for the powder to which the root is reduced has no taste, and looks like flour. SASSAFRÀS.