of the forest, the birds nestle beneath the foliage of the trees, or in the clefts of the rocks; but if in this apparent stillness of nature we listen closely for the faintest tones, we detect, a dull, muffled sound, a buzzing and humming of insects close to the earth, in the lower strata of the atmosphere. Everything proclaims a world of active organic forces. In every shrub, in the cracked bark of trees, in the perforated ground inhabited by hymenopterous insects, life is everywhere audibly manifest. It is one of the many voices of nature revealed to the pious and susceptible spirit of man. ILLUSTRATIONS AND ADDITIONS. Footnote 65: p. 191.—“_Characteristic denominations in Arabic and Persian._” More than twenty words might be cited by which the Arabs distinguish between a Steppe (tanufah), according as it may be a Desert without water, entirely bare, or covered with siliceous sand, and interspersed with spots of pasture land (Sahara, Kafr, Mikfar, Tih, Mehme). Sahl is a depressed plain; Dakkah a desolate elevated plateau. In Persian Beyaban is an arid sandy waste (as the Mongolian Gobi and the Chinese Han-hai and Scha-mo); Yaila is a Steppe covered with grass rather than with low-growing plants (like the Mongolian Küdah, the Turkish Tala or Tschol, and the Chinese Huang). Deschti-reft is a naked elevated plateau.[IK] Footnote 66: p. 191.—“_The old Castilian dialects._” Pico, picacho, mogote, cucurucho, espigon, loma tendida, mesa, panecillo, farallon, tablon, peña, peñon, peñasco, peñoleria, roca partida, laxa, cerro, sierra, serrania, cordillera, monte, montaña, montañuela, cadena de montes, los altos, malpais, reventazon, bufa, &c. Footnote 67: p. 194.—“_Where the map had indicated Montes de Cacao._” On the range of hills from which the lofty Andes de Cuchao have originated, see my _Relation historique_, t. iii. p. 238. Footnote 68: p. 197.—“_Hermesia._” The genus Hermesia, the Sauso, has been described by Bonpland, and is delineated in our _Plantes équinoxiales_, t. i. p. 162, tab. xlvi. Footnote 69: p. 199.—“_The fresh-water dolphin._” These are not sea dolphins, which, like some species of Pleuronectes (flat fish which invariably have both eyes on one side of the body), ascend the rivers to a great distance, as, for instance, the Limande (_Pleuronectes Limanda_), which is found as far inland as Orleans. Some forms of sea fish, as the dolphin and skate (_Raia_), are met with in the great rivers of both continents. The fresh-water dolphin of the Apure and the Orinoco differs specifically from the _Delphinus gangeticus_ as well as from all sea dolphins.[IL] Footnote 70: p. 199.—“_The striped nocturnal monkey._”