Analysis of the Hot Springs at Bath. 343 



Before the experiments made upon the water are related, 

 it will be necessary to state those enip'.oved to ascertain the 

 properties of the gas, which rises in great quantity through 

 the water in the king's bath. 



This gas is perfectly free from smell. 



(A) Some of the gas was received into a jar. A lighted 

 taper put into it was immediately extinguished. 



(B) Received into lime water, it caused an immediate pre- 

 cipitation. 



(C) Tincture of litmus suffered no change of colour by 

 agitation with the gas. 



(D) The colour of dilute tincture of turmeric and infusion 

 of galls was destroyed by it. 



From these effects the gas appears to consist principally 

 of nitrogen cas with a small portion of carbonic acid gas. 

 To ascertain the quantity of each, and whether any oxygen 

 gas was present, the following experiments were performed : 



(E) One hundred measures of the gas were strongly agi- 

 tated with barytes water in a graduated tube. A considera- 

 ble precipitate was deposited, and five measures were ab- 

 sorbed. 



(F) One measure of nitrous gas was added to an equal 

 quantity of the gas in an eudiometer in the water apparatus. 

 The mixed gases underwent no alteration of colour or dimi- 

 nution of volume. 



(G) One hundred measures of the gas which had been 

 deprived of carbonic acid by barytes water were submitted to 

 the actioii of solution of green muriate of iron impregnated 

 with nitrous gas. No absorption took place. 



This gas, therefore, consists of. 



Carbonic acid gas - - 5 

 Nitrogen gas - - - 95 



100 



I now proceeded to try whether the water held either of 

 these gases in solution. 



(H) Ten ounces of the water, which had been cooled in 



a well closed bottle, were put into a vessel furnished with a 



Y 4 be^it 



