588 
PROFESSOR FORBES ON THE TEMPERATURES 
crevice in granite, very near the Mahourat, but quite in the bed of the torrent*, into 
which it immediately flows, no use whatever being made of it. I arrived at it by 
wading through a pool of hot water, and plunged my thermometer as far as possible 
into the fissure. There seems but one principal source, so that there is not likely to 
be any mistake about the spot. It is the hottest spring in this part of the Pyrenees : 
the flow of water is copious. This spring and the last, if not meddled with, would be 
excellent points of comparison for determining any change of temperature. There is 
probably little or no annual variation. — 6. Bain du Bois. Here I was fortunate 
enough to arrive at the spring, or at least within a foot of it. The temperature was 
measured in a little stone conduit exterior to and immediately to the south of the 
bath-house. This is the last of this remarkable series of springs. All the above 
springs are abundant, but especially La Railliere. 
C. Temperature of the Springs. — 1835, August 4. Elevation of Cauteretz above the 
sea, by my observations, deduced from the height of Luz, according to Reboul and 
Vidal, 3096 feet. Copious cold spring near Cauteretz, temperature 52° - 7 Crichton 
== 51 0, 9 reduced. The springs, however, are all at a higher level. 
To the East of Cauteretz. 
To the South of Cauteretz. 
Cl. 
La Poze ..... 
Troughton. 
. . 110-4 
Reduced. 
110-3 
2. 
La Nouvelle Poze . . 
. . 1136 
113-5 
1 3. 
Le Cesar ..... 
. . 118-25 
318-1 
_ „ ..... f Source . 
Troughton, 
. . 102-1 
Reduced. 
lol "9 
1. 
La Railliere < „ 
1 Buvette 
. . 1000 
99-8 
2. 
Le Petit St. Sauveur . 
. . 90-7 
90-6 
3. 
Bain du Pre . . . 
. . Reservoir. 
, r Source 
. . 121-8 
121-7 
4. 
Le Mahourat < c , 
l Spout 
. . 121-3 
121-2 
5. 
Source des Oeufs . . 
. . 1302 
1301 
L 6. 
Bain du Bois . . . 
. . 112-4f 
112-3 
From Cauteretz, which is in all respects one of the most interesting thermal esta- 
blishments of the Pyrenees, we may go to Luz and St. Sauveur, either by re-descend- 
ing the Valley of Cauteretz to Pierrefitte, or by crossing the Col d’Oleon, of which 
the height is 6660 feet by my observations. 
* The Gave du Marcadan, which, with the Gave de Lutour, forms the Gave de Cauteretz. 
t Scale inclined about 45°. 
