the snow, and howling like wolves, in concert with one of the troop, who sits in the middle, and takes the lead in the chorus. The Mexican dogs were castrated, in order that their flesh might become more fat and delicate. On the borders of the province of Durango, and further north, near the Slave Lake, the natives load the larger dogs with their buffalo-skin tents, (at all events they did so formerly,) when, on the change of seasons, they seek a different place of abode. These various details may all be regarded as characteristic of the mode of life led by the nations of Eastern Asia.[DF] Footnote 16: p. 7—“_Like the greater part of the Desert of Sahara, the Llanos lie within the Torrid Zone_.” Significant denominations, particularly such as refer to the form of the earth’s surface, and which arose at a period when there was only very uncertain information respecting different regions and their hypsometric relations, have led to various and long-continued geographical errors. The ancient Ptolemaic denomination of the “Greater and Lesser Atlas”[DG] has exercised the injurious influence here indicated. There is no doubt that the snow-covered western summits of the Atlas of Morocco may be regarded as the Great Atlas of Ptolemy; but where is the limit of the Little Atlas? Are we still to maintain the division into two Atlas chains (which the conservative tendency of geographers has retained for 1700 years) in the territory of Algiers, and even between Tunis and Tlemse? Are we to seek a Greater and a Lesser Atlas between the coast and the parallel chains of the interior? All travellers familiar with geognostic views, who have visited Algeria since it has been in the possession of the French, contest the meaning conveyed by the generally adopted nomenclature. Among the parallel chains, that of Jurjura is generally supposed to be the highest of those which have been measured; but the well-informed Fournel (who was long _Ingénieur en chef des Mines de l’Algérie_) affirms that the mountain range of Aurès, near Batnah, which even at the end of March was found covered with snow, has a greater elevation. Fournel contests the existence of a Little and a Great Atlas, as I do that of a Little and a Great Altai[DH]. There is but one Atlas, formerly called Dyris by the Mauritanians, “a name that must be applied to the foldings (_rides_, _suites de crêtes_), which form the division between the waters flowing to the Mediterranean and towards the lowland of the Sahara.” The lofty Atlas chain of Morocco inclines from north-east to south-west, and not, like the Eastern Mauritanian portion of the Atlas, from east to west. It rises into summits which, according to Renou, attain an elevation of 11,400 feet, exceeding, therefore, the height of Etna[DI]. A singularly formed highland, of an almost square shape (Sahab el-Marga), is situated in 33° north lat., and is bounded to the south by high elevations. From thence