J/dfic/u-s/i-r Jfi-//hu'ri\ Vol. xliv. {igoo), No. V<\. 5 



tainiiiij water, and towers filled with broken cjla.ss, down 

 which a stream of water or alkali llowed. In this wa\- a 

 complete absorption of the oxides of nitrogen was effected, 

 and nitric acid or nitrates were respectively formed. 



Durini;" the experiment, readings of the power con- 

 sumed in the tlame wore taken over}- half hour. .After 

 the expiration of a definite period — usually about 12 

 hours — the average reading in watts was calculated. 



The WouHtTs bottles and towers were then emptied, 

 well washed with water, and the quantit\- of nitric acid 

 produced estimated b)- tituration with standard alkali. 



The combustion-chamber underwent several modifica- 

 tions before a final form was decided upon. The first 

 {Fig. I ) consisted of a large glazed-earthenware pipe 76 cm. 

 in length and 20 cm, in diameter, supported horizontally. 

 Both ends were closed by slabs of slate. A perfectly 



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