1893.] 



On the Composition of Water by Volume. 



131 



retransferred to J, and expelled through the tap 9 into an absorption 

 tube, and analysed with potassium hydrate and pyrogallol for carbon 

 dioxide and oxygen, and for gases not absorbed by these reagents. 

 These gases were most probably nitrogen, hydrogen, and carbon mon- 

 oxide (from the absorbents). The mixture thus obtained gave at any 

 rate a maximum value for any impurity in the gases employed ; when 

 it fell below 1/110,000 the gases were considered pure. 



k 2 



