The air on the summit in winter and in the shade, is generally about 15° lower than that of the town; but in summer a fleecy cloud called the "Table-cloth" appears on the mountain and gives indication of an approaching storm. This cloud is composed of immense masses of fleecy whiteness. It does not appear to be at rest on the hill, but to be constantly rolling onward from the southeast; yet, to the surprise of the beholder, it never descends, because the snowy wreaths seen falling over the precipice towards the town below, vanish completely before they reach it, while others are formed to replace them on the other side. The two principal rivers on the western coast are the Berg or Mountain river, and the "Elephants' river," and these are only navigable by small crafts to the distance of about 20 miles up the country. On the south coast is Broad river. Its mouth, now called Port Beaufort, allows vessels of 200 tons to enter, and discharge or load in safety. The river Gamity, the next in size on the coast, is a collection of waters from the Great Karroo and Black[249] Mountains. In the rainy season it is a rapid and dangerous stream. Most of these rivers swelled by periodical rains, deposit much mud and sand at their mouths. Some of them during the dry season are lost amid the sand and rocks. In this colony the seasons are divided into Monsoons, of which there are two, annually; the one wet, and the other dry. The wet monsoon is called winter, and the dry, summer. The weather during the wet monsoon is disagreeable and moist, but the cold is not severe. Ice is never more than an eighth of an inch thick. Thunder and lightning are very rare and seldom violent. The atmosphere is healthy and agrees well with European constitutions. The cape has long been celebrated among naturalists as a fertile field for their labors. Almost every animal found on the African continent may be found in the neighborhood of this colony. Two varieties of lions, the yellow and the brown, zebras, elephants, rhinoceros, the giraffe and buffalo, are all found there. Wine is manufactured at the Cape and exported in considerable quantities. Many kinds of wine are extremely cheap, and a large quantity is consumed in the colony. Cape Town, the capital, was founded in 1652, and is built with great regularity. The streets are wide, intersecting each other at right angles. There are some 1500 houses which are for the most part constructed of stone, cemented with a glutinous kind of earth, and are generally white-washed on the outside. Their height is seldom more than two floors, frequent storms rendering a greater elevation dangerous. Many of the houses[250] have trees planted before them, which gives a rural appearance to the town.