Hot springs are to be found issuing from the bases of
every range. I have seen them in the valleys of the
Yang-tze, Mekong, and Salween, further south in the valley
of the Shweli, and continuing westwards, within the basin
of the Irrawaddy. Perceptible earthquake shocks occur
from time to time at A-tun-tsi and Batang, and no doubt
a seismograph would be continually recording slight tremors;
the numerous landslips which take place in the A-tun-tsi
district, for instance, suggest a certain amount of instability
not wholly to be accounted for by the heavy rains.
A little to the north of T'eng-yueh, on the low water-
shed between the Irrawaddy and Shweli river-systems, an
ancient volcano stands sentinel over the remnants of its
lava beds, which have flowed down beyond T'eng-yueh
on the one hand and across the Shweli valley on the other.
17 — 2



260 The Land of Deep Corrosions

The cone and crater still preserve their form admirably,
and Mr Coggin-Brown of the Indian Geological Survey,
who has examined the country, considers that the volcano
was active within the last four hundred years, perhaps at
the time that western Ssu-chuan was so badly shaken and
Batang engulfed.
