88 



sample produced, an examination of the rock from which it issued 

 shewed that it contained no trace whatever of Rock Salt. 



An attempt was made to stop back the water, which was found 

 both expensive and troublesome in sinking, and for that purpose 

 the shaft was lined for 30 feet with iron casting, technically- 

 called "tubbing," the operation being attended with some 

 degree of success. In thus damming back the water, it was 

 necessary to carry a small vent pipe from the casting, as high 

 up the shaft as the water would rise, in order to carry off any 

 pent-up gasses; and it was found that the water rose up the 

 pipe to a height of 102 feet. The pressure under this head of 

 water was so considerable, that the water forced its way 

 through joints and fissures in the strata, and did not rise any 

 higher ; but it is probable that the natural level of the water 

 may have been much higher than was indicated by the height 

 of the water in this pipe. 



Through the kindness of Mr. Coomber, principal of the 

 Merchant Venturers' School in Bristol, whose valuable assistance 

 the writer is glad to have this opportunity of acknowledging, he 

 is enabled to supply the following analysis of the water. Writing 

 on the 5th February, Mr. Coomber states as follows : — 

 "I have made a qualitative analysis of your sample. 

 " There is almost as much matter dissolved in the sample as in 

 sea water. 



" Next to the Chloride of Sodium present (Sea Salt), Lime 

 Salts occur in greatest quantity. There is a considerable 

 quantity of Carbonate of Lime held in solution by Carbonic 

 Acid. 



" Potassium Salts also occur in quantity, Alkaline Carbonate 

 is present, and perhaps both Potash and Soda are present in 

 this form. 



" There are also present in small quantity Iron, Alumina, 

 Magnesia, Lithia, Sulphuric Acid and a trace of Phosphoric 

 Acid." 



