444 Sot Springs, and other Natural Features of the Pyrenees. 



rendered, in this and the following tables, according to the 

 ordinary rnle of conversion, by their equivalents in the 

 Fahrenheit scale. The correction of between one and two 

 tenths of a degree Fahrenheit, to be applied additively for the 

 index-error of the instrument, would, in general, bring the 

 observations in August 1865 into closer coincidence with those 

 of older dates than those already given in the table. 



The spring called " Les Oeufs" — from the strong odour of 

 rotten eggs that it emits — is the fullest, hottest, and strongest 

 of all the springs at Cauterets. It is proposed to conduct it 

 into the town, a distance of more than a mile from its actual 

 source ; one-half of which distance has been accomplished, and 

 the spring now escapes from its tube by the road-side, near 

 the Point de la Railliere. This point is apparently the point 

 of escape described by Dr. Scoresby Jackson in 1863, and. the 

 temperature appears to have risen one degree. 



The variations noticed at these springs at Cauterets in 

 thirty years are small and insignificant; when their generally 

 high temperatures are considered. Equally small changes 

 occur in six springs at Bareges, and at Bagneres de Bigorre, 

 observed in August 1863 and 1865. The spring of the 

 Platane, at Bagneres de Bigorre, of which the reservoir, or 

 griffon, is exposed to the air, exhibits from this circumstance a 

 somewhat more considerable alteration. 



Temperatures of certain thermal springs at Bareges and 

 Bagneres de Bigorre, in 1863 and 1865 : — 



Name and point of Spring 

 observed. 



Temperatures, in degrees, Fahrenheit. 



August, 

 1863. 



August, 

 1865. 



Increase. 



Decrease. 



1° at Bareges 



O 



109-10 



92-30 



95-00 



110-40 



89-00 



87-80 



1 



o 



109-37 



90-29 



94-97 



109-37 



90-11 



88-13 



o ■ 



V 27 



1-11 

 0-33 



o 



2-01 

 003 

 1-03 



Tambour, buvette 



2° at Bagneres de Bigorre... 

 Platane, griffon 



Foulon, griffon 



La Heine, buvette 



De la Montagne ") .,*> 

 (Salut) j griffon ... 



De l'lnterieur) n , , 



(Salut) }^ ette - 



In the establishment of the Salut, the griffon of the 

 " Source de la Montagne," is a horizontal gallery, driven 

 several yards into the rock, in the floor of which the spring, 



