Artesian Springs or Wells. 83 



The use, too, of the instrument before mentioned, renders 

 our calculations upon the regularity of the increase very satis- 

 factory. 



We shall subjoin, in a tabular form, the result of our expe- 

 riments on the temperature of the artesian wells, and the 

 rate of increase as we descend. 



L\st of the Localities, Temperature, and Rate of Increase of the Artesian 

 Springs, mentioned in the present communication. 



A simple inspection of this table will shew how very nearly 

 the results of different localities approximate ; and if we take 

 the average number of these results, 1° for every 48 feet as 

 we descend, we shall find that it comes very near the average, 

 as fixed upon by the British Association, which is 1° for every 

 45 feet of depth. On comparing this table with the follow- 

 ing, which has been di-awn up from a variety of sources, but 

 more especially from papers Avhich are to be found in Pro- 

 fessor Jameson's Journal, we shall find that the average of 

 the former is much less than the latter, and this chiefly in 

 consequence of some of the observations we have quoted ha- 

 ving been made on enclosed waters at the bottom of old pits. 



* This is the supposed depth ; accurate information regarding it could 

 not be procured. 



t Mr Kiucaid has furnished mo with this oliservation, on which perfect 

 reliance can be placed. 



