254? PFAFF ON RESPIRATION. 



"which agrees perfectly with the experiments of Davy, who 



found that no more than 5,1 cubic inches of azote gas were 



abforbed by 19 refpirations of a volume of 161 cubic inches. 



Experiment* II, To determine the quantity of carbonic acid gas pro 



quantises of duced by the refpiration of atrnofpheric air, 60 cubic inches 



carbonic acid were refpired once during ten or twelve feconds, and received 



■intioa m ^ " over mercur y when expired. Lime water abforbed 4,68 parts 



in 100. Tins experiment being feveral times repeated 



gave the fame refult. The laft portion of expired air being 



feveral times transferred through lime water was dimiuilhed 



4,9 parts in 100. 



12. 20 Cubic inches refpired three fucceffive times during 

 10 feconds afforded no more than five hundredths of carbonic 

 acid gas. 



13. 170 Cubic inches were refpired four times during 

 50 feconds, the quantity of carbonic acid gas obtained was 

 5,8 hundredths. 



1+. 1^0 Cubic inches were refpired from a bladder eight 

 times in one minute. Lime water abforbvi 8,2 hundredths. 



This quantity of carbonic acid produced by refpiration, 



afforded a term of comparifon to afcertain the quantity of the 



decompofition of oxigen gas in refpiration from the fama 



quantities of atmofpheric air, and of pure oxigen gas. 



Oxigen gas The preceding experiments (7) had (hewn that the diminu- 



producesmore tion of oxigen gas was more coniiderable than that of atmofc 



refpiration^than pheric air. From this faft it might be expected, that that 



atmofpheric air production of carbonic acid gas would likewife be more con- 



^" fiderable; and this was confirmed by direct experiments. 



15. 170 Cubic inches of oxigen gas obtained from man- 

 ganefe, were refpired four times during 50 feconds; the 

 diminution was 30 cubic inches. The quantity of carbonic 

 acid produced was 8,2 hundredths. Atmofpheric air refpired 

 an the fame manner, and under the fame circum fiances, gave 

 only 5,8 carbonic acid. 



16. 70 Cubic inches refpired from a bladder during 50 

 feconds, alfo gave eight hundredth* of carbonic acid. 



Experiments on the Refpiration of the Gafeous Oxide of Carbon, 



Obfervatlons on The gafeous oxide of azote was obtained by the procefs of 



the method of p from CTy fa\\\zed nitrate of ammonia. This nitrate of 



obtaining J J 



gafeous oxide of ammonia affords very different products in different tem- 

 axotc. peratures. 



