Along the coast, and for some miles inland, the grass grows rank and sour, and is only eaten by stock when in the young and succulent stage. Later in the season, when the pasture becomes dry and woody, it is quite unfit for grazing purposes. In these parts merino sheep are rarely found, the ravages of a disease named Heartwater having denuded the farms of all small stock, with the exception of the common or Boer goat, which thrives fairly well, and is kept in small flocks for milking and slaughter. The soil of the grass veldt being deficient in lime, the stock naturally crave for salt, and in the northern districts farming cannot be carried on successfully without a liberal supply being provided for large as well as small stock. The grass country is, as a rule, better supplied with water than any other part of the colony, the average annual rainfall being over twenty-seven inches. There are also numerous streams and springs which rarely fail even in the most severe droughts. The mixed grass and karroo country of the central districts is especially adapted for Angora goat-farming, though at the same time merino sheep are kept in large numbers. The pasture consists mainly of sweet grasses, interspersed with karroo bushes of various kinds, and dwarf trees, among which may be mentioned the Spekboom (_Portulacaria afra Jacq_), a fleshy, round-leaved, soft-wooded tree, which is a most valuable food for sheep, cattle, goats, and even horses. The thornless species of the prickly pear (_Opuntia Tuna_) is invaluable in seasons of drought; and both the wild thorn and the mimosa tree furnish food of a nourishing and sustaining nature. In the north and south-west, Angora goats do not thrive so well, but in these localities merino sheep and Boer goats are kept in large numbers. Steek grass (_Aristida congesta R and S_) grows in many parts of the mixed veldt, and is one of the greatest drawbacks to successful farming. The seeds of this grass do not readily fall when ripe, and are thus liable to be carried away by sheep and goats in their fleeces. Many clips are seriously damaged by this seed, which mats the hair and wool into hard solid masses, and often working through the fleece pierces the skin, causing intense irritation, and in some cases even death. The rainfall varies considerably. In the north and central districts the annual average is a little over sixteen inches, while in the south-west it is almost twenty-four inches. As a rule the former portion is but poorly watered, the farmers depending to a large extent on springs and the artificial storage of water. The karroo is well adapted for Angoras, as well as goats of the common type. More than one-half the number of the Cape sheep in the Colony is found in this region, which, owing to its vast extent and low rainfall, is better suited for animals of an active and hardy nature.