C)G SIXTH RKPOUT — 1S3C. 



part of Von Hoff's statement, although ahle to confirm the gene- 

 ral truth of his representation. 



Stifft, in his geological description of the neighbourhood 

 of Wiesbaden*, remarks, that the following facts have been ob- 

 served by himself relative to the springs of the Nassau territory. 



1st. That they follow distinctly six lines, and thus evince a 

 determinate direction. 



2nd. That the rocks in their neighbourhood manifest evident 

 changes in the direction and inclination of their sti-ata, especially 

 saddle-shaped elevations, often accompanied with fractures. 



3rd. That in many places the adjacent rocks themselves ap- 

 pear altered, and are more friable than elsewhere. 



In my memoir on Thermal Springs already referred to, I have 

 pointed out several instances of the same connexion, between 

 the existence of evidences of dislocation in the strata, and the 

 bursting out of thermal springs, as occurring along the line of 

 the Pyrenean chain, as at Aleth, Rennes, and Campagne, and 

 still more remarkably at St. Paul de Fenouilhedes, on the road 

 from Carcassone to Perpignan, near the town of Caudiez, all in 

 Roussillon. The same fact is still more strikingly illustrated, by 

 the structure of the country at St. Vincent's rocks, as described 

 by Conybeare and Bucklandf , and at Matlock, as long ago 

 pointed out by Whitehurstl ; for, since the rocks from which the 

 thermal waters in these two instances proceed, are stratified, the 

 inference, to which the mere inspection of the localities conducts 

 us, is confirmed by the unconformable disposition of the strata 

 themselves ; we not only observe springs gushing out from a 

 narrow and precipitous cleft, but we find on examination the 

 strata tilted up and disarranged, in a manner which implies that 

 some violent action must have taken place. Mr. Murchison 

 and Mr. Lyell§ have also remarked, that the hot spring of Aix 

 in Provence lies contiguous to some remarkable dislocations of 

 the strata. 



We must not, indeed, strain too far our inferences from this 

 one circumstance ; for it is probable, as has lately been shown by 

 Mr. Hopkins II, that natural springs, of VA^hatever temperature, 

 have their origin very commonly in fissures, which appear owing 

 to dislocations or disturbances in the strata. 



The latter, however, exhibit no evidences of violence, at all 

 comparable to those afforded by the great natural chasms, to 



* In Rullman's Wiesbaden. 



+ Geological Transactions, vol. i. New Series, " On the South West Coal 

 Field of England." 



X Whitehurst's Theory of the Earth, 1786. 



§ Edinburgh New Philosophical Journal. 



jl Cambridge Philosophical Transactions, 1836. 



