Adeney and Becker — Solution of Nitrogen and Oxygen. 387 



Since these methods proved inapplicable, it only remained to make the 

 analyses by means of an extraction pump and eudiometer in the usual way. 

 This method had also the advantage of affording a check on the estimation of 

 oxygen, since the determination of the dissolved nitrogen and carbon dioxide 

 could be included with but little additional labour. 



Fig. 1. — Mercury Pump and Storage Pipette. 

 The apparatus employed was a modification of the form described by one 

 of the authors in the Supplementary Volume VI to the Fifth Keport of the 

 Eoyal Commission on Sewage Disposal, p. 96. 1 It consists of a mercury pump 



See also Proceedings Roy. Dubl. fcioc., 1890, p. 542. 



3q2 



