On Respiration. 431 



previously found to contain 3 per cent, azote ; these 30 

 parts being detonated in Davy's improved Volta's eudiome- 

 ter, by the electric spark, were reduced to 3 parts, and 

 these 3 parts being treated with the tests for oxygen, were 

 reduced to 2 parts, a proof that all the hydrogen had been 

 consumed; but the 10 parts of oxygen contained 0*3 of 

 azote ; this deducted from 2, leaves r? for the azote con- 

 tained in 20 parts of the residuum 78. 

 20 : 1-7 :: 73 : 6-6 

 The mixture employed, therefore, contained in every 100 

 parts 22 oxygen 



6-6 azote 

 71 '4 hydrogen 



100 



We next examined the gas which had been respired. 



No. 1. 250 cubic inches respired during fifteen minutes. 



100 parts, subjected to the action of lime water in Pepys's 

 eudiometer, were reduced to 93-5, and this by the tests for 

 oxygen vi-as further diminished to 77 : 20 parts of this 77, 

 mixed with 10 of oxygen and detonated, the residuum 

 treated with the tests for oxygen, lei't 12 parts wliich wer« 

 azote. 



From these 12 parts 



Deduct '3 for the azote in the 10 parts oxygen, 



Leaves ll'7 for the azote contained in 20 pants 

 of the residual 77. 



20 : 11-7 : : 7Z : 45 

 No. 1. therefore consisted in 100 parts, of 

 6' 5 carbonic acid 

 16*5 oxygen 

 45. azote 

 39 hydrogen 



100 



No. 2. 250. Respired during thirteen, minutes; 100 



{)arts were reduced by lime water to 92-5, and these by th« 

 ests for oxygen to 77. Of these 77 parts, 20 being mixed 

 with lO' of oxygen, and detonated, were diminished to 4, 

 and ty^cse 4 being exaaiined for oxygea left 3, which must 

 dc azote : 



D d 3 From 



