National Institute of Informatics - Digital Silk Road Project
Digital Archive of Toyo Bunko Rare Books

topographical details concerning Mr. John-
son's Yangi-dawán and his route beyond
towards Karanghu-tâgh, see my note on John-
son's map and the topography of the K'un-lun
south of Khotan, in the Alpine Journal, 1921,
xxxiv. pp. 62 sqq.

Limited as the actually surveyed area
within this sheet is, it includes three well-
marked portions of distinctive character:
utterly sterile basins characteristic of the
extreme north-west of Tibet; the main K'un-
lun range with its deep-cut valleys draining
northward into the Yurung-kâsh river, and
the high open plateaus between the Kara-

koram and the Kara-kâsh river.

Corrections. D. 1. The ascent up the
glacier at the head of the Turgap valley
(Sheet No. 9. D. 4), to about long. 79° 42′
lat. 35° 59′, ought to have been indicated;
cf. Desert Cathay, i. 200 sq.

D. 2. The approximate position of
Mr. Johnson's 'Naia Khán-dawán' may
conjecturally be placed at about long. 79° 46′
lat. 35° 58′.

D. 2. Peak 8/52 M (23,309) has not
been shown on the map according to its com-
puted longitude 79° 51′ 0″; see Appendix A,
points in 52 M.

NOTES ON SHEET No. 11 (MUZ-ART)

The survey shown in this sheet is con-
fined to the vicinity of the route leading from
the south to the Muz-art pass on the main
T'ien-shan range, and to a small portion of
the outer hills above the tract of Kara-bâgh.
The plane-table work of R. B. Lâl Singh
was adjusted to the position adopted for the
Tengri-khán Peak in the map accompanying
Dr. Merzbacher's The Central Tian-shan
Mountains, London, 1905, and to the plot-
ting of the adjoining sheet No. 12.

The heights shown for Tengri-khán and

another high snowy peak sighted from the
route are taken from Dr. Merzbacher's map
in the Central Tian-shan Mountains. So is
also that of the Muz-art pass, the summit
of which the surveyor was unable to reach
owing to the heavy snow encountered. His
visit took place in the first half of May when
the snow still lay low, and on this account
the approximate level of the snow-line and
the extent of the glaciers shown are subject
to doubt.

NOTES ON SHEET No. 12 (KARA-YULGHUN, BAI)

Of the routes falling within this sheet
only those from the terminal course of the
Khotan river to Ak-su and north-east of this
town were followed in 1908; the rest were
all surveyed in 1915, along the foot of
the mountains by R. B. Lâl Singh, the one
between Bai and Ak-su by myself, and the
two further south by surveyors Afrâz-gul
and Muhammad Yakûb, respectively.

The plotting of the sheet is based on
the positions adopted for Ak-su and Kuchâ
in Sheets No. 7, 17 and on that for the junc-
tion of the Ak-su and Yârkand rivers. For
the latitude of the last the value observed by
Dr. Hedin, viz. 40° 28′ 47″, was used, while
the longitude adopted is the mean between
the values obtained by interpolation between
Kâshgar and Korla and between Khotan and
Ak-su. Latitude observations taken by Dr.
Hedin were utilized for a number of points on
the Târim river. For Muhammad Yakûb's
traverse along this river, a check on longi-
tude was afforded also by the position of Peres

(Sheet No. 17. B. 2), where the former is
crossed by the desert route from Kuchâ to the
Keriya river. Similarly the adopted position
of Tengri-khán (see Notes on Sheet No. 11)
was used in the adjustment of the route
leading from Ak-su to the Muz-art pass.

In the northern portion of the sheet
lies the subordinate basin of Bai (C, D. 1),
enclosed between the foothills of the main
T'ien-shan and a much-eroded outer range.
The Muz-art river and some of its tributaries
supply irrigation to considerable tracts in
this basin. The same is the case with part
of the submontane area between Ak-su and
Jam (A. 2) which receives water from the
snowy main range. The large volume of
the Ak-su river renders irrigation possible
along both its banks for a considerable dis-
tance.

Between the foot of the above men-
tioned outer range and the jungle belt
accompanying the Târim stretches an area
of scrubby desert. The existence of certain