THE VOLCANIC ROCKS OF ICELAND. 81 



Gas from the Thermal Springs at Aix-la-Chapelle. 



93. 94. 



Kaiserquelle. Corneliusquelle. 



( • > ■■ " ' 



Gas Gas diffused Gas Gas diffused 



evolved through evolved through 



freely. water. freely. water. 



Nitrogen 66*98 900 81-68 779 



Oxygen O'OO 1-23 0*00 0*00 



Carbonic acid . . . 30*89 89*40 17*60 92-21 



Sulphuretted hydrogen 0-31 0*00 0*00 0*00 



Marsh gas ... . 1-82 0-37 0-72 O'OO 



Hydrogen .... O'OO 0*00 O'OO O'OO 



Carbonic oxide . . . 0*00 0*00 0*00 0*00 



Olefiantgas .... 0*00 0*00 0-00 0-00 



100-00 100-00 100-00 100-00 



95. 96. 



Quirinusbad. Rosenquellc. 



Nitrogen 6*41 9-14 



Oxygen 0*08 000 



Carbonic acid .... 93-25 90*31 



Sulphuretted hydrogen 0*00 O'OO 



Marsh gas 0*26 0*55 



Hydrogen 0*00 0*00 



Carbonic oxide . . . 000 O'OO 



Olefiant gas ... . 0*00 0*00 



100-00 10000 



Gas diffused in the Sulphuretted Water of Nenndorf, 



97. 98. 99. 



Medicinal Spring under Bath 



spring. the roof. spring. 



Nitrogen 17*30 19-71 23*91 



Oxygen O'OO 0-00 0*00 



Carbonic acid .... 69-38 68-29 72*63 



Sulphuretted hydrogen . 11*86 11*72 3*29 



Marsh gas ... * . 1*46 0*28 O'l? 



Hydrogen 0*00 000 0*00 



Carbonic oxide . . . 0*00 0*00 0*00 



Olefiantgas .... 000 0*00 0*00 



100*00 100*00 100*00 



SCIEN. MEM.— Nat. Phil. Vol. I. Part I. G 



