Water abounds even at a distance from the rivers; it springs from the soil in diminutive runnels and lies in “shimo” or pits, varying from surface-depth to 10 feet. The monsoon-rains, which are heavy, commence in March, about a month earlier than in Zanzibar, and the duration is similar. The climate of the higher lands is somewhat superior to that of the valley, but it is still hot and oppressive. The formation, after passing from the corallines, the limestones, the calcareous tuffs, and the rude gravelly conglomerates of the coast, is purely primitive and sandstone: erratic blocks of fine black hornblende and hornblendic rock, used by the people as whetstones and grinding-slabs, abound in the river-beds, which also supply the clay used for pottery. The subsoil is near the sea a stiff blue loam, in the interior a ruddy quartzose gravel; the soil is a rich brown or black humus, here and there coated with, or varied by, clean white sand, and in some parts are seams of reddish loam. Fresh-water shells are scattered over the surface, and land-crabs burrow in the looser earths where stone seldom appears. Black cattle are unknown in the maritime region, but poultry, sheep, and goats are plentiful: near the jungle they are protected from the leopards or ounces by large wooden huts, like cages, raised on piles for cleanliness. As a rule, the fluviatile valleys resemble in most points the physical features of the coast and island of Zanzibar: the general aspect of the country, however--the expression of its climate--undergoes some modifications. Near the sea, the basin is a broad winding line, traversed by the serpentine river, whose bed is now too deep for change. About the middle expanse stony ridges and rocky hills crop out from the rolling ground, and the head of the valley is a low continuous plain. In many places, especially near the estuary, river-terraces, like road embankments, here converging, there diverging, indicate by lines and strews of water-worn pebbles and sea-shells the secular uprise of the country and the declension of the stream to its present level. These raised seabeaches at a distance appear crowned with dwarf rounded cones which, overgrown with lofty trees, are favourite sites for settlements. In the lower lands the jungle and the cultivation are of the rankest and most gigantic description, the effect of a damp, hot region, where atmospheric pressure is excessive. The grass, especially that produced by the black soils in the swamps and marshes, rises to the height of 12-13 feet, and serves to conceal runaway slaves and malefactors: the stalks vary in thickness from a goose-quill to a man’s finger. The larger growths, which are so closely planted that they conceal the soil, cannot be traversed without paths, and even where these exist the traveller must fight his way through a dense screen, receiving from time to time a severe blow when the reeds recoil, or a painful thrust from some broken and inclined stump.