Between these two mountain chains the head streams of the Parana and Sao Francisco are intermingled - the one flowing inland and southward to the-great La Plata estuary, the other northward and eastward across the arid highlands of Brazil to the Atlantic coast in io ° 30' S.
This phenomenon occurs among species found at high elevations, among others found in arid or desert regions, and in some cases in the female sex only, the male being winged and the female wingless.
In 1897 all the forts on the Samana were attacked by the Orakzais, arid this and the Afridi attack on the Khyber Pass were the two chief causes of the Tirah Expedition.
In the semi-arid districts on the south slope of the mountains the flora consists chiefly of dry grasses, acacias, yuccas and cactuses.
Its semi-arid character is due to the mountain ranges on its northern frontier, which extract the moisture from the north-east trades and leave the Brazilian plateau behind them with a very limited rainfall, except near the Atlantic coast.
They are drained and in large part enclosed by the North (or Belle Fourche) and South forks of the Cheyenne river (at whose junction a fur-trading post was established about 1830); and are surrounded by semi-arid, alkaline plains lying 3000 to 3500 ft.
When the attempt was made to mark this boundary the commissioners were unable to agree on a line across the Puna de Atacama in the north, where parallel ranges enclosing a high arid plateau without any clearly defined drainage to the Atlantic or Pacific, gave an opportunity for conflicting claims. In the south the broken character of the Cordillera, pierced in places by large rivers flowing into the Pacific and having their upper drainage basins on the eastern side of the line of highest crests, gave rise to unforeseen and very difficult questions.
The flora of Argentina should be studied according to natural zones corresponding to the physical divisions of the country - the rich tropical and sub-tropical regions of the north, the treeless pampas of the centre, the desert steppes of the south, and the arid plateaus of the north-west.
On the arid plateaus of the north-west, the guanaco and vicuna are still to be found, though less frequently, together with a smaller species of viscacha (Lagidium cuvieri).
This element was introduced via Torres Strait, and spread down the Queensland coast to portions of the New South Wales littoral, and also round the Gulf of Carpentaria, but has never been able to obtain a hold in the more arid interior.
This flora, isolated by arid country from the rest of the continent, has evidently derived its plant life from an outside source, probably from lands no longer existing.
Fishing and trawling are carried on chiefly off the Italian (especially Ligurian, Austrian and Tunisian coasts; coral is found principally near Sardinia and Sicily, and sponges almost exclusively off Sicily arid Tunisia in tile neighborhood of Sfax.
A snow-capped mountain ridge or an arid desert forms a barrier between different forms of life which is often more effective than an equal breadth of sea.
The rhomboidal peninsula of the Crimea, connected by only a narrow isthmus with the continent, is occupied by an arid plateau sloping gently N.
The survey for the Truckee-Carson system was begun in 1902, with the object of utilizing the waters flowing to waste in western Nevada for the irrigation and reclamation of the adjacent arid regions in Churchill, Lyon and Storey counties.
The Atlantic coast-line of the territory has one deep indentation - the Gulf of San Matias - but, owing to the arid surroundings, there are no ports or towns upon it.
Its climate is less hot and arid, its natural productiveness much greater, and its population more settled and on the whole more advanced.
The whole tract, excepting south-eastern Arabia, is nominally subject to Turkey, but the people are to no small extent practically independent, living a nomadic, pastoral and freebooting life under petty chiefs, in the more arid districts, but settled in towns in the more fertile tracts, where agriculture becomes more profitable and external commerce is established.
Hence he must always be rigorously checked where other authorities exist arid used with caution where he is our sole informant.
It everywhere shows a preference for a moist but well-drained soil, and never attains its full stature or luxuriance of growth upon arid ground, whether on plain or mountain - a peculiarity that should be remembered by the planter.
Firdousi's own education eminently qualified him for the gigantic task which he subsequently undertook, for he was profoundly versed in the Arabic language arid 1'itefature and had also studied deeply the Pahlavi or Old Persian, and was conversant with the ancient historical records which existed in that tongue.
Apart from the arid wastes of the Karst, the soil is well adapted for the growing of cereals, especially Indian corn; olives, vines, mulberries, figs, pomegranates, melons, oranges, lemons, rice and tobacco flourish in Herzegovina and the more sheltered portions of Bosnia.
The higher ranges of the Elburz are snow-capped for the greater part of the year, and some, which are not exposed to the refracted heat from the arid districts of inner Persia, are rarely without snow.
Here it bends south again, and with many a zigzag continues its general westerly direction, crossing the arid plains of Bechuana, Bushman and Namaqualands.
It is a stony, semi-arid region, thinly wooded, having good grazing campos in its extreme western section.
South of the Amazon valley and filling a great part of the eastern projection of the continent, is another arid, semi-barren plateau, lying within the southeast trade winds belt, and extending from Piauhy southward to southern Bahia.
Above the sea in the borderland between the fertile and wooded regions of the Sudan on the south and the arid steppes which merge into the Sahara on the north.