Mr. Horner on the Geology of the Environs of Bonn. 463 



Mineral Waters. 



There are three springs of some celebrity ; at Roisdorf and Godesberg near 

 Bonnj and at Heppingen near Landskron, in the valley of the Ahr. They ai'e 

 cold, and contain a considerable quantity of carbonic acid gas. Their con- 

 tents, according to analyses which have been published, are as follow : 



Roisdorf*, 1'37 volume of carbonic acid gas : 



Carbonate of soda 7*86 



Sulphate of soda 4*78 



Muriate of soda 1 9*01 



Phosphate of soda 0'06 



Carbonate of lime 2'81 



Carbonate of magnesia 3'98 



Iron, alumina, and silica, about -27 



S8-77 in 10,000 parw. 



Godesberg f, about 1 6 cubic inches of carbonic acid gas in a pound of the water, and 



Carbonate of soda 7*00 grains. 



Carbonate of magnesia 3*32 



Carbonate of lime . ., 2*70 



Muriate of soda 1-33 



Carbonate of iron '75 



15-10 in lib. 



Heppingen J, 80 cubic inches of carbonic acid gas in 100 cubic inches of water, and one pound of 



water yielded 



Carbonate of soda 6*20 



Carbonate of magnesia 2"40 



Muriate of soda 3"00 



Sulphate of soda 2*10 



Carbonate of lime 1*30 



15-00 



No mineral waters appear to have been found within the region of the Sie- 

 bengebirge§ ; and no water from which any calcareous deposit has been pro- 

 duced exists in any part of the district : there seems, indeed, to be an entire 

 absence of limestone in any form. 



* Bischof, Die Mineralquellen zu Roisdorf. Bonn, 1826. 



t Wurzer, in Harless, Gesundbrunnen in Grosherzogthum Nieder Rhein. 1826. 



J Funke, in Harless, uti supra. 



§ Harless, uti supra. 



