AND GEOLOGICAL RELATIONS OP CERTAIN HOT SPRINGS. 
585 
C. Temperatures of the Springs . — 1835, July 11. Estimated height by barometrical 
measurements of my own-f, (referred to the height of Argellez, determined by 
Reboul and Vidal,) 2208 feet. Temperature of a fine common spring in the town, 
5 1 °'7 (Cr.) = 50 o, 9 (reduced). 
Crichton. 
Reduced. 
*Esquirette 
. . . . 93-2 
9T4 
*Clot 
94-6 
*Rey 
... 93-8 
92-0 
* f Robinet A . . 
Arresecq ( RoWnet B 
. . . 77-5 
• • . 77 ' 4 
76*3 
76-2 
Baudot 
, . . . 81*5 
80-2 
II. Eaux Bonnes. 
A. Geological Position . — The valley of the Eaux Bonnes forms, as we have stated, 
a lateral branch of that of Ossau. It is entirelv formed in limestone, and does not 
present the same decided marks of disruption as that of the Eaux Chaudes. Its de- 
clivity is also much greater, the height of the baths being 784 feet above Laruus, 
which is placed at the union of the two valleys, and of which I estimate the height at 
about 1774 feet above the sea. The springs rise from limestone, in a very small 
lateral valley on the side of the principal valley next the axis of the chain. Although 
these springs are not immediately connected with granite (so far as we can see), yet 
that rock is to be found at no great distance, and in vast masses in two directions ; 
the one in the valley of Ossau, as already specified, the other near the top of the 
Vallee d’Azun, stretching, I suspect, further westward than is indicated in the map 
of Charpentier. 
B. Specialties of the Springs. — The springs of the Eaux Bonnes are sulphureous, 
like those of the Eaux Chaudes. The only hot spring which does not pass into closed 
reservoirs (afterwards to be artificially heated for the baths) is the Source Vieille, 
which issues directly from a marble pillar by a spout close to the spot from 
which it rises, and without the intervention of any reservoir or conduit^;. About 
200 yards distant is the cold sulphureous spring of which I have spoken in the in- 
troduction to this paper, which issues directly from the limestone rock, and is merely 
protected by a small vertical wall and spout. It flows constantly, but is inconsider- 
able in amount, as are all the springs which I have had an opportunity of directly 
inspecting at the Eaux Bonnes and Eaux Chaudes, which are only about two leagues 
separate. The cold spring contains even more sulphur than the hot one ; it is also 
f In these experiments I used Bunten’s barometer, (Quai Pelletier, Paris,) which amongst the many forms 
which I have tried appears to me by far the best adapted to the wants of the traveller. 
J On the authority of M. Darralde, the Medical Inspector. 
4 F 
MDCCCXXXVI. 
