and the other Azores. 2683 
cles is apparent. It has many of the characters of Tripoli 
It is used by the peasants as an external application for cu- 
taneous diseases, and is undoubtedly beneficial in some par- 
ticular cases, from the quantity of sulphur it contains.” 
“ The vicinity of the springs is se by the eee 
temperature of the earth, a sulphureous odour, and the e 
cape of = or steam from teen rete and fissure in the 
ground. ‘The temperature of the clay continues to increase 
as we advance, and a greater quantity of vapour is at last 
seen slowly ascending from the springs themselves. The 
volumes of smoke and steam rolling upwards from the sur- 
face to a great height; till they are gradually diffused 
iene the atmosphere, or mingle with the heavier clouds 
that crown the summit of the mountains, produce a striking 
wie "The confused, rumbling, and hissing noise, that is 
heard for some time before we arrive in sight of the springs 
increases at last to an incessant and terrific roar, and seems 
to issue from the very spot on which we stand. T 
returns a hollow sound, and great caution is required to 
avoid stepping into the pools and streams of boiling water, 
with which its surface is covere 
The mcerherte of hot water discharged through the in 
aggre we oe in the ground is prodigiously great, and 
he different streams unite, forming a sma r that, 
still hot, joe the Ribeira Quinte. The largest cra 
are termed “ caldeiras,” or boilers, and a shallow basin of 
earthy matter has been formed round — of them, by de- 
positions from the water. Much of the water is constantly 
retained within these reservoirs, and its teh is more or 
less agitated by the escape of sulphuretted hydrogen gas, 
and the ejection of the water from below. The tem 
ture of some of these springs on the poms of December, 
between three and four o’clock P. mometer 
ae at 63° Farhr’t. the barometer ‘at 29, 4 was as fol- 
207°—200°——96°— 137° —203° 
/190°—134°. LL Ra PP ed 1 48 
1 
thirty fet in diameter. “ The water in this, boils with 
greater violence than in any other caldeira, and dis- 
