_Flax._――A species of flax was found by Lewis and Clarke growing in the valleys of the Rocky mountains, and on the banks of the Missouri. The bark possesses the same kind of tough fibres as the common flax, and the Indians are in the habit of making lint and gun-waddings of it. _Berries._――The gooseberry is indigenous to the United States, and in the western parts grows to great size. The red raspberry is also indigenous. Whortleberries, and blackberries high and creeping, are found in prodigious abundance; many of the prairies are red with strawberries. The cranberry is a native of the country, growing in morasses and rich bottom through its whole extent. Large cranberry swamps occur in New Jersey. _Other Plants._――There are many annual and evergreen creepers in the United States, of various kinds, form and foliage. The grasses are various and luxuriant. In the prairies they are rank and coarse; the Atlantic country is covered with a fine sward. The rush is a useful herbaceous plant, which grows on bottoms of an elevation between that of the cane brakes and the deeply-flooded lands. The pea-vine covers the richer soil of the forest lands; it is small and fibrous. The wild rice is a plant of great importance, found on the marshy margins of the northern lakes, and in the shallow waters of the upper courses of the Mississippi. One of the most striking of the forest productions is the wax-plant, which is nearly entirely of a snow-white, and resembles the most delicate wax preparation. It grows in rich shady woods, and is much prized. The common kinds of water-plants are found in the marshy grounds and ponds; particularly a very beautiful and fragrant lily. This closely resembles the European water-lily. One of this genus is said to be unrivalled for size and beauty. Dr. Barton considers it to be the same as the sacred bean of Judea, and mentions it as abundant in Philadelphia, but rare otherwise, and refusing propagation. Mr. Flint found it in the southern states, and says that it attains great splendor on the lakes and stagnant waters of the Arkansas. There is a large variety of parasitic plants in the states, the most remarkable of which is the long moss. It will be observed that in these chapters on the natural history of the United States, we have only intended to describe the most conspicuous objects, without reference to scientific arrangement. A mere scientific catalogue of the natural productions of our country would occupy all the space we have devoted to the subject, and possess no interest or attraction for the general reader. GENERAL REMARKS ON BOTANY.