606 
PROFESSOR FORBES ON THE TEMPERATURES 
termination of the granite in this line, for during the remainder of the course of the 
Tech it is not again met with, and after a few miles that river joins the Mediterranean. 
The limestone overlying the granite is of a variegated kind, having a marked resem- 
blance to the coloured limestones of the valleys of Arreau (near Caudiac), Luchon 
(at Cierp), and Sallat (near St. Girons). This identity of mineral character is well 
marked throughout many of the Pyrenean rocks. It may be added that the springs 
of Arles rise in a granitic ravine, which, like that of the Graus dOlette , is almost cer- 
tainly a fissure. This narrow defile contains a wall of Roman construction, destined 
to separate a part of the river and convey it to the village of the baths ; it is called 
in the country the “Mur d’Annibal.” It is worthy of remark, that in the Valley of 
the Tech we have an insulated deposit of stratified rocks surrounded by granite, as 
in the Tet ; and that the baths of La Preste (which I did not visit), above Prats de 
Mollo, must be situated close to the boundary. 
B. Specialties of the Springs. — These are very numerous ; I confined my attention 
to one or two of the most remarkable. — 1. Gros Escaldadou. Extremely copious. I 
arrived almost close to its source in the vineyard behind the baths, and took its tem- 
perature in the stone conduit by which it is conveyed, a very unexceptionable obser- 
vation. It furnished, according to Anglada, the enormous quantity of 715 litres per 
minute. The litre is xoVodth part of a cubic metre. — 2. Petit Escaldadou ; at a little 
distance from the other in a vineyard. It is hotter but much less copious, and is not 
employed. I took its temperature as it rose from the soil just under a wall. — 3. Fon- 
taine de Manjolet. Small. Taken at the buvette. Anglada states that it is col- 
lected first in a reservoir. — 4. Along the banks of the little tributary of the Tech, 
which passes the baths of Arles, are several smaller springs, which rise from granite 
in a perfectly natural state. I took the temperature of one of these, called the Gourg- 
Negre (goulfre noir). It rises from a crevice in the granite close to the rivulet, in a 
difficultly accessible spot a little above a slight expansion of the rivulet, used as a 
bathing pond, but considerably below the Mur d’Annibal. It is pretty copious. It 
appears to be the Source Villeseque of Anglada. I must add that the thermal esta- 
blishment of Arles is as a relic of antiquity by far the most remarkable in the Pyre- 
nees. The stately vaulted apartment in which the modern cabinets have been erected 
is entirely a Roman structure, and is still allowed to retain its ancient piscinae. The 
springs are sulphureous, and contain baregine. 
C. Temperature. — The elevation of the baths of Arles must be almost the same as 
that of the town (which is about a mile further up the Tech), and which, according 
to Rocheblave, is 909 feet above the sea. Anglada informs us that he frequently 
took the temperature of the Gros Escaldadou, and found it invariably the same ; on 
one occasion after the interval of a year. 
