Russia | Page 4

south-eastern Russia it is much warmer than in the corresponding latitudes of France, and really hot weather is experienced everywhere. It does not, however, prevail for long, and in the first half of September the first frosts begin to be experienced on the middle Urals; they reach western and southern Russia in the first days of October, and are felt on the Caucasus about the middle of November. The temperature descends so rapidly that a month later, about October 10 on the middle Urals and November 15 throughout Russia the thermometer ceases to rise above the freezing-point. The rivers rapidly freeze; towards November 20 all the streams of the White Sea basin are covered with ice, and so remain for an average of 167 days; those of the Baltic, Black Sea, and Caspian basins freeze later, but about December 20 nearly all the rivers of the country are highways for sledges. The Volga remains frozen for a period varying between 150 days in the north and 90 days at Astrakhan, the Don for 100 to 110 days, and the Dneiper for 83 to 122 days. On the Dwina ice prevents navigation for 125 days and even the Vistula at Warsaw remains frozen for 77 days. The lowest temperatures are experienced in January, in which month the average is as low as 20° to 5° Fahr. throughout Russia; in the west only does it rise above 22°.
The flora and fauna of Russia.--The flora of Russia, which represents an intermediate link between those of Germany and Siberia, is strikingly uniform over a very large area. Though not poor at any given place, it appears so if the space occupied by Russia be taken into account, only 3,300 species of phanerogams and ferns being known. Four great regions may be distinguished:--the Arctic, the Forest, the Steppe, and the Circum-Mediterranean.
The Arctic Region comprises the tundras of the Arctic littoral beyond the northern limit of forests, which last closely follows the coast-line with bends towards the north in the river valleys (70° N. lat. in Finland, on the Arctic Circle about Archangel, 68° N. on the Urals, 71° on West Siberia). The shortness of summer, the deficiency of drainage and the thickness of the layer of soil which is frozen through in winter are the elements which go to the making of the characteristic features of the tundras. Their flora is far nearer those of northern Siberia and North America than that of central Europe. Mosses and lichens cover them, as also the birch, the dwarf willow, and a variety of shrubs; but where the soil is drier, and humus has been able to accumulate, a variety of herbaceous flowering plants, some of which are familiar also in western Europe, make their appearance.
The Forest Region of the Russian botanists occupies the greater part of the country, from the Arctic tundras to the Steppes, and it maintains over this immense surface a remarkable uniformity of character. Viewed as a whole, the flora of the forest region must be regarded as European-Siberian; and though certain species disappear towards the east, while new ones make their appearance, it maintains, on the whole, the same characters throughout from Poland to Kamchatka. Thus the beech, a characteristic tree of western Europe, is unable to face the continental climate of Russia, and does not penetrate beyond Poland and the south-western provinces, reappearing again in the Crimea. The silver fir does not extend over Russia, and the oak does not cross the Urals. On the other hand, several Asiatic species (Siberian pine, larch, cedar) grow freely in the north-east, while several shrubs and herbaceous plants, originally from the Asiatic Steppes, have spread into the south-east. But all these do not greatly alter the general character of the vegetation.
The Region of the Steppes, which covers all Southern Russia, may be subdivided into two zones--an intermediate zone and that of the Steppes proper. The Ante-Steppe of the preceding region and the intermediate zone of the Steppes include those tracts where the West-European climate struggles with the Asiatic, and where a struggle is being carried on between the forest and the Steppe.
The Steppes proper are very fertile elevated plains, slightly undulated, and intersected by numerous ravines which are dry in summer. The undulations are scarcely apparent to the eye as it takes in a wide prospect under a blazing sun and with a deep-blue sky overhead. Not a tree is to be seen, the few woods and thickets being hidden in the depressions and deep valleys of the rivers. On the thick sheet of black earth by which the Steppe is covered a luxuriant vegetation develops in spring; after the old grass has been burned a bright green covers immense stretches, but this rapidly disappears under the burning rays of the sun and the hot