OF CERTAIN HOT-SPRINGS IN THE PYRENEES. 461 



selves, called Central. Commonly, however, and sufficiently for our present pur- 

 pose, they are divided into southern and eastern groups. 



Southern Group. 



The springs of this group emerge from the granite. We visited them in the 

 following order : — 



La Raillere. — The water of this spring is conducted into an establishment 

 constructed at its source. We took the temperature first at the buvette, where 

 my thermometer marked 101 -30 Fahr., at the same time the thermometer of 

 MM. DE Lalande and Broca marked 88'70 Cent. = 101-66 Fahr. We then passed 

 to the back of the building and observed the temperature at the gynffon, which is 

 five and a half metres (=18-044 English feet) from the buvette. Here I found 

 the temperature to be 101 '80, whilst MM. de Lalande and Broca gave it as 

 39-00 Cent. =.102-20 Fahr. 



Mauliourat. — There are two drinking places to this spring, — one at a distance 

 of two metres ( = 6-562 English feet) from the griffon, and the second at a dis- 

 tance of 260 metres ( = 853 034 English feet). The buvette at the latter point is 

 known as the Petit Mauliourat, and was constructed for the convenience of in- 

 valids who may find it too fatiguing to go to the principal buvette near the griffon, 

 the Petit Mauliourat being 260 metres nearer Cauterets. The water is conducted 

 from the source to the more distant huvette by means of pipes. The temperature 

 recorded by me at the distant buvette {Petit Mauliourat) was 117*150 Fahr., that 

 by MM. de Lalande and Broca 47-50 Cent. = 117-50 Fahr. At the principal 

 buvette, near the source, my thermometer marked 121-00 Fahr., that of MM. de 

 Lalande and Broca 49 50 = 121 10 Fahr. 



Les (JEufs. — We observed the temperature of this water at three points, — 

 namely, at the griffon; at the buvette 300 metres (=984-270 English feet) distant 

 from the griffon (nearer Cauterets, and in the same building as Petit Mauliourat) ; 

 and again 1400 metres (=4593*259 English feet) below the latter point (or 1700 

 metres from the griffon) at the Pont de la Raillere. It is intended to carry the 

 water of Les CEufs into Cauterets by means of pipes, the operations for which had 

 been conducted only as far as the Pont de la Raillere, hence I had an opportunity 

 of recording the temperature of the water there. The distance still to be accom- 

 plished, from the Pont de la Raillere to Cauterets, is 1200 metres ( = 3937"079 

 English feet). The temperature of the water at the several points of observation 

 was as follows : — 



Thermometer D. MM. de Lalande and Broca. 



Griffon 131-00 Fahr. 5500 Cent. = 131-00 Fahr. 



Buvette 300 metres from griffon, 128-00 ,, 53-50 „ =12830 „ 



Escape 1700 metres from griffon, 119-00 „ 48-50 „ =119-30 „ 



Le Pre. — The temperature of this water was taken at the buvette, which is 



