188 
[July, 
General Walker's Map of Turkestan. 
went over the ground near the river, taking bearings and pacing distances, 
whereas the Eussian surveyors had not then extended their operations 
anything like so far to the south. 
Of Sheet 3 the greater portion has been re-drawn on the basis of 
Major St. John’s Map of Persia, with additions and corrections up to 
date, which were obligingly furnished by Major St. John. Major Wilson’s 
Map of Afghanistan has been borrowed from to a large extent; and the 
conclusion at which' he arrived, on an examination of certain documents 
which were lodged in the India Office—after the first Afghanistan War— 
that the longitude of Kandahar is probably some 10 to 15 miles to the 
east of the position hitherto assigned to it on most maps, has been accept¬ 
ed. Eecent surveys have shown that Major Wilson is probably correct ; 
and moreover it is known that the longitude hitherto adopted was a pro¬ 
visional value, chosen arbitrarily, with the intention that it should be 
rectified, after the reduction of Lieut. Durand’s astronomical observations 
in 1813 for the determination of the longitude ; but apparently through 
some oversight Lieutenant Durand’s value was not employed, and the 
provisional value has been adopted ujs to the present time. 
Colonel MacGregor’s Eeconnoissance across the Desert of Beluchis- 
tan ; and Major Napier’s Sketch of the northern Frontier of Khorassan, 
have been used in the compilation of Sheet 3. The recent operations of 
the Survey officers attached to General Stewart’s Division of the Army 
in Afghanistan, have been available to some extent, for the purpose of 
adding to, and correcting the details of the routes between IChelat, Quetta 
and Kandahar ; but the information derived from this source has as yet 
been very little, the greater portion of the maps not having reached the 
Surveyor General’s Office. 
Sheet 4 contains much new geography which has been obtained from 
other Survey officers with the armies in Afghanistan. An area of nearly 
8,000 miles has been reconnoitered on the south-east frontier by Captains 
Heaviside and Holdich, while accompanying the column marching with 
General Biddulph from Kandahar to Dera Ghazi Khan, by the Tal-Chotiali 
route. A considerable area has also been surveyed in the valleys of Kur- 
ram, Kliost, and Alikheyl, and generally in the country to the south of 
the Safed Koh Kange, by Captain Woodthorpe, in connection with the 
movements of the column under General Eoberts. And extensive addi¬ 
tions to our knowledge of the country to the north of the Safed Koh 
Kange, and for some distance beyond the Kabul Kiver, have been made 
by Major Tanner, Captains Strahan and Leach, and Mr. G. Scott. Alter¬ 
ations in the delineation of the basins of the northern affluents of the 
Kabul Kiver, which take their rise in the western portion of the Hindu 
