PART 3.] 
Theobald: Sail-springs of Pegu. 
69 
the Arakan and Pegu ranges. The On-nay-da-gyee spring near the frontier lies almost 
exactly on this line, which, if considered as one line, measuring from On-nay-da-gyee to 
Waddau-tha, is sixty-tliree miles in length, with a general coincidence of direction with 
the hill ranges bounding the valley. 
On this line likewise is situated the spot known as Naht-mi or “ the spirits fire,” thirty 
miles north by west from N ummayahn, and which is merely a spot in the jungle from which 
marsh-gas issues through cracks in the soil, and becomes, from time to time, either intentionally 
ignited or accidentally during the prevalence of jungle fires. AboveNummayahn, in the 
river bed, there is considerable disturbance, as evinced by vertical strata, and it seems probable 
that all the springs of this group rise along one and the same line of fracture, probably 
a highly contorted anticlinal, though this may not be indicated by the appearance of the 
rocks at the surface, at the actual point of issue of the springs, which may mainly depend 
on local conditions, surface arrangement, denudation, and the like. 
A little west of this lir.e occur other springs (Nos. 8, 21, 9), which may or may not 
issue primarily along the same Subterranean line of disturbance or fracture; but this is neither 
material nor possible to say. 
Associated with this system of springs may be classed the Boolay, Lay my on ng, and 
Tayzahn springs. The Boolay springs were simple wells sunk in sandstone at the mouth 
of the Boolay stream, but which have been long disused. The Laymyoung spring rises 
on the top of a low ridge forming mud pools from which a little marsh-gas escapes, much 
after the fashion of the Nummayahn springs, only much more feebly. Near the mouth 
of the Boolay stream, above where the road crosses, and close to the village of K wonbool ay, 
occurs the only hot spring known to me in Pegu, but it rises in the bed of the river, so 
that its temperature cannot he well ascertained, and sometimes it is entirely concealed 
beneath the sand. 
The third line of springs is by far the most important, embracing probably several 
closely arranged parallel lines; and if we assume theSalnigi spring on the frontier to 
belong to this group, this line would Beem to follow a curve, generally corresponding with 
that followed by the Arakan range. The Sailngi and Day-heng springs are situated in a 
line thirty-four miles long, with a general bearing north-west by north, with the Lengbhan 
and Shuagyeing springs a little on either side of it, and distant seventeen miles from the 
Arakan range. Prom Day-heng to Shah-si-bo the line is forty-two miles, with a hearing 
north by west, distant fourteen miles from the Arakan range, and marked by a perfect 
belt of salt springs. Prom Shah-si-bo southwards, the springs are rather more scattered, 
and run in a direction almost due south, the most southerly one recorded, No. 79, being 
one hundred and twenty-four miles in a straight line from the frontier spring of S ah ngi. 
This rich belt of springs is situated among a group of harsh dark indurated shales 
and sandstones; tho induration beiug variable in amount, and never approaching mefamor- 
phism, properly so called, within the area immediately adjacent to the salt springs in 
question. Pew or no fossils have been found in these rocks, certainly not within the above 
area, but their relation to the unaltered rocks of the district lends support to the view of their 
being possibly of nummulitic age. 
In view, then, of tho occurrence of these springs most numerously along lines corres¬ 
ponding to the general strike of the beds of the district, and of the direction, moreover, 
of the twin ranges which bound the Irrawadi valley; and having regard to tho indica¬ 
tions of compression aud violent disturbance winch the rocks in their vicinity often 
display; in view, too, of the association with them, on the samo lines of strike, ol the 
only hot spring in tho province, and of spots whence issue both petroleum and marsh-gas, 
we may fairly assume that they rise along widely extended lines ot disturbance, (anticlinal 
fissures most probably,) from the lower beds of the nummulitic or some still older group. 
