The principal trees are the oak, the valonia oak, the beech, ash, elm, plane, celtis, poplar and walnut, which give way in the higher regions to the pine and fir.
The three principal regions for the production of tobacco are the basin of the Garonne (Lot-et-Garonne, Dordogne, Lot and Gironde), the basin of the Isre (Isre and Savoie) and the department of Pas-de-Calais.
It grows in short grass in the temperate regions of all parts of the world.
The excessive heat of the upper regions compels him to descend, and he next visits the bottom of the sea in a kind of diving-bell.
Geologically Sardinia consists of two hilly regions of Pre-Tertiary rock, separated by a broad depression filled with Tertiary deposits.