And on the Trojan Plain. 197 
with the appearance of this spring. He says, 
“it gushes perpendicularly out of the earth, 
rising from the bottom of a granite and mar- 
ble reservoir, and throws up as much water 
as the famous fountain of Holywell.(28) “Its 
surface seems vehemently boiling, and during 
cold weather the condensed vapour above it 
causes the appearance of a cloud of smoke 
over the well.”’ And he adds, that, ‘the 
marble and granite slabs which form the ba- 
sins appear to be of the highest antiquity.” 
The testimony of Sir William Gell is still 
more important. He states that he saw the 
smoke or steam over the source nearest Bour- 
nabashi, (the reputed warm spring) and that 
the water felt warm to the touch. The other 
spring, which wasof like temperature at the. 
_mouth, did not send up any steam from its, 
reservoir. 
It is not difficult to account for the appa- 
rent difference of temperature between the 
two springs. The warm spring rises in a 
single jet of water into a small reservoir, 
where it always retains its primitive temper- 
ature. ‘The neighbourhood of this reservoir 
is low and marshy, and it is completely en- 
(28) In this, however, we cannot agree with Dr. Clarke, but should 
think that half the quantity of water thrown up at Holywell would 
rather exceed, than fall short of, that ejected by the spring in question, 
