We now come to the second group of climatic phenomena, pressure and wind conditions. The Ukraine may, in this respect, be divided into two great regions. The line of high pressure which separates these parts, called by Voiekoff the great axis of Europe, extends from the bend of the Volga, near Tsaritsin, over the porohi section of the Dnieper at Katerinoslav to Kishinev. North of this line, west winds prevail, bringing Atlantic air into Northern Ukraine. In the south, east winds prevail, bearing the influences of the Asiatic steppe climate. This wind divide is most distinct in winter. In the northern part of the Ukraine we find chiefly west and southwest winds, which mitigate the frosts and cause precipitations of rainfall; in the southern part dry, cold east winds prevail, increasing the cold. Sometimes the east wind increases to a snowstorm (metelitzia, fuga) which whirls up terrible masses of [93]snow, filling the air with snowflakes until absolutely nothing can be seen, and causes terrific destruction. Herds of a thousand head fall victim to its icy breath, even in the steppes of Crimea, and woe to the traveler who is caught in a snowstorm in the steppe. In November and December, in Southern Ukraine, moist, warm south winds frequently come up from the Pontus. But the absolute balance is on the side of the freezing east winds, to which is to be ascribed the severe winter climate of Southern Ukraine. The northern half of the Ukraine as a rule, is seldom reached by the east winds, the northwestern corner very seldom. Their occasional appearance is accompanied by heavy frosts with fair weather. In the spring, east and south winds blow, especially over Southern Ukraine. They often change to heavy sand-storms (sukhovi) very harmful to the crops, which carry clouds of sand, with which they form miniature dunes as high as 30 cm. The east and south winds, at such times, penetrate even into Northern Ukraine, altho with the exception of the northwest corner. In the summer, on the other hand, the west, northwest, and southwest winds hold a decided balance over the east winds, even in Southern Ukraine. They bring moist Atlantic air and rain into the entire land and mitigate the heat. The occasional east winds increase the heat and bring periods of drought, but usually not until August, when they are rather frequent. In September all the winds are weak thruout the Ukraine, with high pressure. That is why the fall is so beautiful too. Then, in October and November, follows the gradual transition to the winter wind conditions.