762 



Notes and Correspondence. 



[Oct., 



mountains, at a rate that may be 

 slow enough in one sense, but which 

 has been much more rapid than 

 the effect of weather and water in 

 weai-ing away by denudation all 

 evidence of the work done. Thus 

 it is, that the appearance and nature 

 of the rocks, and the nature of the 

 scenery in Eastern Europe and 

 Western Asia are eminently charac- 

 teristic of the most recent of the 

 operations that have been continu- 

 ally going on, but which are masked 

 and lost in Western Europe, where 

 there has been far more denudation 

 than deposit, and where the tertiary 

 rocks are comparatively unimpor- 

 tant. 



As a general conclusion to these 

 remarks, on the naphtha springs of 

 the Crimea, I would point out that 

 their value and importance are to 

 be estimated only when they are 

 viewed as parts of a whole, and as 

 among the results of volcanic ac- 



tion on a very large scale in very 

 recent times. I think no one can 

 study the evidence I have here 

 brought forward, — I am sure no 

 one could examine the phenomena 

 on the spot, — without being struck 

 with the mutual relation of the oil 

 springs, the mud volcanoes, the 

 sulphur springs, and the general 

 form of the country. The same 

 may be said with regard to the 

 whole expanse of volcanic country 

 from the south shore of the Caspian, 

 to midway along the south coast 

 of the Black Sea. It is only by 

 considering the phenomena as a 

 whole, that they can in any way be 

 understood, and thus I have ven- 

 tured to generalize and connect 

 rather than to give a mere detailed 

 account of the particular points 

 examined. 



D. T. Ansted. 

 Athenceum Club, London, 

 August, 1865. 



The Oeological Structure of the Districts of Trichinopoly, Salem, and 

 South Arcot. (Correction.) 



I should feel much obliged if yon 

 would kindly, in your next ' Quar- 

 terly Journal,' correct a rather seri- 

 ous error which has crept into the 

 appendix to the ' Eeport on the 

 Geological Structure of the Districts 

 of Trichinopoly, Salem, and South 

 Arcot,' by Mr. King and myself, 

 and which has been perpetuated 

 in the very complimentary review 

 given in your April number. 



The number of tons of charcoal 

 required to smelt a ton of the mag- 

 netic iron is 3i, and not 13i, as 

 stated in the Report (p. 161) and 

 copied into the review (p. 343). 



E. Bruce Foot, 



Geological Survey of India. 

 Yercand, Madras, 

 Jidy 11, 1865. 



