82 Mr Hardie on the Geology of Central India. 



over, the general temperature of" the year has doubtless some 

 influence, but every tiling demonstrates that this influence is;^l:i 

 together of secondary importance. uBtafih 



" It is probable that all the glaciers extend themselves down- 

 wards with nearly the same rayiidity ; if their velocity be known, 

 we might be able to calculate beforehand their future progres- 

 sion or retrogression ; which would be of great importance for 

 the cultivation of the Alps. It is difficult to appreciate what 

 would be necessary to allow in this calculation to the resistance 

 which the movement of the nearly horizontal glaciers expe- 

 riences. All the measures known to me of the progressive ad- 

 vance of the glaciers are false, because they ^re taken by the 

 distances from the inferior extremity of the glacier to a deter- 

 minate point, without taking into account the melting which 

 has taken place at this extremity. Therefore, since we attri- 

 bute in this manner to a glacier a progression of from 40 to 50 

 feet per annum, a more accurate measure would unquestionably 

 give a much more considerable distance. The points to choose 

 for this observation should be taken only on the glacier itself, 

 and on its two borders." — Bibliotheque Universelle, 1830-1. , 



On the Geology of the Secondary Formation of the Meyxvar 

 District. By James Hardie, Esq. " Residency Surgeon, 

 Oudeypore Meywar, Member of the Asiatic Society, of the 

 Medical and Physical Society of Calcutta, &c. In a Letter 

 to Professor Jameson. 



Sir, 



X HOUGH a long period of time has elapsed since you did me 

 the honour to publish in the " Edinburgh New Philosophical 

 Journal "" the paper to which this letter refers, 1 have had no 

 opportunity of perusing it in its printed form till very lately, 

 when the state of my health led me to visit Calcutta. I should 

 otherwise have long ere this made some reply to the queries con- 

 tained in your editorial notes. Since drawing up the paper in 

 question, I have had several opportunities of making new ob- 

 servations on the geology of Central India ; and have thus been 

 enabled to correct many inaccuracies into which I at first fell. 

 I feel, however, that any thing I can communicate on this in- 



