The range of mountains bounding the Kachi to the westward is a continuous wall with imperceptible breaks only, and it bears the local names of Gindari, Takari, and Kirthar. Through this uniform rampart there are two notable rents or defiles, viz.: the _Mulla_ opening opposite Gundana, leading to Kelat; and the _Bolan_ entering near Dadur, leading to Quetta, Kandahar, and Herat. The Bolan is an abrupt defile--a rent in the range,--the bottom filled with the pebbly bed of a mountain torrent. This steep ramp forms for sixty miles the road from Dadur, elevation 750 feet, to the Dasht-i-Bedowlat, elevation 6,225 feet. This inhospitable plateau and the upper portion of the Bolan are subject to the most piercingly cold winds and temperature; and the sudden change from the heat of the Kachi to the cold above is most trying to the strongest constitutions. Notwithstanding the difficulties of the road, the absence of supplies and fuel, and the hostile character of the predatory tribes around, this route has been always most in favor as the great commercial and military communication from Persia, Central Asia, and Khorassan to India. The causes which led to the establishment of a British garrison at Quetta are not unlike those which are urged as good Russian reasons for the occupation of territory in certain parts of Central Asia. Briefly stated, it seems that after the conquest of the Punjab, the proximity of certain disturbed portions of Biluchistan, and the annoyance suffered by various British military expeditions, in 1839-1874, from certain tribes of Biluchis--notably the Maris and Bugtis,--made it desirable that more decisive measures should be adopted. In 1876 a force of British troops was marched to Kelat, and by mutual agreement with the Khan a political agency was established at Quetta, ostensibly to protect an important commercial highway, but at the same time securing a military footing of great value. But the character of the lords of the soil--the Maris, for instance--has not changed for the better, and the temporary general European occupation of the country would afford an opportunity to gratify their predatory instincts, which these bandits would not hesitate to utilize. The Maris can put 2,000 men into the field and march 100 miles to make an attack. When they wish to start upon a raid they collect their wise men together and tell the warriors where the cattle and the corn are. If the reports of spies, sent forward, confirm this statement, the march is undertaken. They ride upon mares which make no noise; they travel only at night. They are the most excellent outpost troops in the world. When they arrive at the scene of action a perfect watch is kept and information by single messengers is secretly sent back. Every thing being ready a rush of horsemen takes place, the villages are surrounded, the cattle swept away, the women and children hardly used--fortunate if they escape with their lives.