CHANCES PRODUCED IN AIR BY RESPIRATION. ] QJ 



The total volume after the experiment appears to be 278*82 

 cubic inches. 



300 — 278-82 zz 21-18. 



The loss of oxigen in this case was 21*18 cubic inches. Oxigenab- 



" sorbed. 



We are disposed to consider the 1 1th as a standard expe- Accordin 

 riinent relative to carbonic acid gas, because the quantity of experiments, 



air respired in a given time is pretty near the average of the ab0Vfc }* oz - 

 •> ■ r . & •' , • , troy of carbon 



first ten experiments; and because it very nearly agrees with emitted from 



the statement of Professor Davy. In this experiment 292 the ,un f*s daily, 



r. a , . ., y. • nr • i and395i?4cub. 



cubic inches or carbonic acid gas were given oft in eleven inches of oxi- 



minutes; the barometer was 30*4, the thermometer 50°, the 8 en gas con- 

 volume being calculated at the mean, viz. barometer 30, 

 thermometer 60°, will be 302 cubic inches given off in ele- 

 ven minutes, or 39534 cubic inches in twenty-four hours, 

 supposing the production to be uniform during all that pe- 

 riod; and as 100 cubic inches of carbonic acid gas weigh 

 47*26 grains, 



100 : 47*26 : : 39534 : 1868376; 



the weight of the carbonic acid gas amounts to 18683.76^ 

 grains; and estimating the carbon in it at 28 parts in ]0Q> 

 according to Lavoisier, or 28*60, as calculated in the expe- 

 riments on diamond, recorded in the Society's Transactions, 



100 : 28*60 : : 18683*76 : 5363*55 grains; 



it will follow, that 5363*55 grs. or aboye 11 oz. troy of solid 

 carbon, are emitted by the lungs in the course of twenty- 

 four hours; and that 39534 cubic inches of oxigen gas are 

 consumed in the same time, £ut when we consider, that in % ut this more 

 respiration perfectly natural a much smaller quantity of air than the com. 

 can come in contact with those parts of the lungs calcula- mon aTera K e ' 

 ted to act upon it, the proportion of carbonic acid gas given 

 off in natural respiration ought probably to stand considera- 

 bly lower than in the above estimate; but at all events it will 

 be very considerable. 



Sixteenth Experiment, 



Having made so many experiments upon atmospheric 

 air, we now proceeded to ascertain the effects produced menu 

 Vol. XXII.— March. 1809. O upon 



