or CERTAIN HOT- SPRINGS IN THE PYRENEES, 



459 



placed immediatel}^ in contact with the griffon, or point of emergence, at the foot 

 of a block of granite. The temperature recorded by me was 51-80 ; M. de Pietra- 

 Santa recorded 11-00 Cent. = 51-80 Fahr. 



The following table shows the temperature of the springs at Eaux Chaudes, 

 as recorded by different observers at various periods. I give the Centigrade as 

 well as the Fahrenheit reading of the temperature. 



^arae of Observer, 



Le Clot. 



L'Esquirette. 



Le Key. 









and 

 ate of Observation. 



(Buvette.) 



(Griffon.) 



(Bnvette.) 



(Griffon.) 



(Burette.) 



(Griffon.) 



(GrilTon.) 



(Griffon.) 





F. 



C. 



F. 



0. 



F. 



C. 



F. 



0. 



F. 



0. 



F. 



0. 



F. 



C. 



F. 



C. 



^orbes (July 1835), . 



94-60 



34-78 







91-40 



33-00 



... 





92-00 



33-35 



80-20 



26-78 



76-30 



24-62 







itan (Sept. 1835), . 



97-07 



36-15 







89-00 



32-00 



... 





92-57 



33-65 



81-05 



27-25 



77-18 



25-10 







atan (Sept. 1837), . 



96-80 



36-00 



... 





90-68 



32-60 





... 



93-20 



34-00 



80-78 



27-10 



77-18 



25-10 



52-25 



11-25 



itrac (1841), . . . 



96-80 



36-00 





... 







... 





93-20 



34-00 



... 



... 











iorFilbol (1850), . 



93-38 



34-10 









... 







94-64 



34-80 



... 







... 



... 





naocnier (1860), . 



97-16 



36-20 



95-00 



35-00 







92-30 



33-50 





... 



77-00 



25-00 



76-64 



24-80 



52-70 



11-50 1 



Pietra-Santa (1863), 



94-10 



34-50 



93-56 



34-20 



92-30 



33-50 



91-40 



3300 



89-60 



32-00 



77-00 



25-00 



75-20 



24-00 



51-80 



11-00 



resby-Jackson(1863), 



94-00 



34-45 



93-60 



34-33 



92-40 



33-56 



9140 



33-00 



90-00 



32-22 



77-00 



25-00 



74-90 



23-85 



51-80 



11-00 



EAUX BONNES. 



At Eaux Bonnes, also, I had the able assistance of M. de Pietra-Santa. 

 There are several springs, but three only w^re available for my purpose, the rest 

 being mixed in such a manner as to prevent the temperature of each being taken 

 separately. The springs whose temperature I tested were La Vieille, Source du 

 Bois, ou Soicrce Froide, and Source d'Orteich. 



Both the griffon and the buvette of La Vieille Source are within the thermal 

 establishment, and are within four feet of each other, being separated only by a 

 wall, through which the water is conveyed by a short pipe. At the griffon, the 

 temperature was not easily taken. The chamber in which it is situated was 

 gloomy, so that we could not read the thermometers without the aid of a candle ; 

 and even with that aid we could not read them whilst immersed in the water, the 

 opening into the spring being very narrow, and the column of mercury, when the 

 bulb was immersed, being below the level of the opening ; that is, below the floor 

 of the chamber. Even'Vith my face touching the floor and close to the opening, 

 I could not read the thermometer without raising it several inches, and when I did 

 see the column it was subsiding so rapidly that I could not be certain of having 

 seen it at its highest point. To obviate this difficulty, we placed the thermo- 

 meters in a wine bottle, which was then lowered into the water, filled, and 

 allowed to remain until the bottle assumed the temperature of the water. It was 

 then withdrawn, and the thermometers were read whilst yet immersed in the 

 water. The temperature recorded by me was 91 20 Fahr.; that by M. de Pietra 



VOL. XXIII. TART III. 6 I 



