464 DR R. E. SCORESBY-JACKSON ON THE TEMPERATURE 



bar£ges. 

 I visited Bareges after leaving St Sauveur, and on the same day observed 

 the temperature of the springs at both places. At Bareges I had the able and 

 cordial assistance of Dr Le Bret, the medical inspector of the establishment, 

 and well known as one of the editors of the Dictionnaire General des Eaux 

 Minerales. The establishment at Bareges is so constructed that the griffons are 

 not approachable. There are no galleries, the water being conducted immediately 

 into the baths, which are built close to the actual sources. The only experiment 

 which I made at Bareges was on the temperature of the Tambour (called also 

 Grande-Douche). I observed the temperature of this spring at the Burette of the 

 new establishment, the distance, as I understood from Dr Le Bret, between the 

 point of observation and the actual source not exceeding one metre. I observed 

 the temperature with thermometer D, and at the same time Dr Le Bret observed 

 it with his own thermometer, which was a much shorter instrument than mine, 

 and the Centigrade degrees were closely marked. The result of our observations 

 was as follows : — 



Fahrenheit. Centigrade. Difference (Fahr.) 

 Thermometer D, . . . 109-10 =.■ 42-83 \ . 



DrLeBret, .... 110-30 = 43-50 ] ^'^^ 



The difference between our observations could not be reduced by the most 

 careful repetition, and therefore I concluded that the thermometers were at vari- 

 ance. On returning to Dr Le Bret's house, I placed both thermometers in a 

 tumbler of cold spring water, and having allowed them to remain a sufficient 

 length of time, we both examined the instruments with the following result : — 



Fahrenheit. Centigrade. Difference (Fahr.) 

 Thermometer D, . . . . 6440 = 17-83 "1 ^ „ 



DrLeBret, .... 6530 = 18-50 J 



By this experiment I conclude that our observations at the spring were both 

 correct, and that between the temperatures 18-50 and 43-50 Centigrade, Dr Le 

 Bret's thermometer marks 1-20 Fahr. higher than mine. 



Dr Le Bret kindly furnished me with the results of observations made by 

 Professor FiLHOL in 1862; they will be found at length in the A ?i7iales de la 

 Societe d' Hydrologie Medicale de Paris, tome neuvieme, p. 369. I give them along 

 with others in the following tabular form : — 



