$N THE QUANTITY OF CARBON IN CARBONIC ACID. £3 J 



Correction for temperature. 



60° 0*103 49.84 



57 3 -30 



_ ... 



3 difV. 0-309 add for temp. 50*14 



Correction for pressure, 

 30:29*65 :: 50'14: 49*55. 



The quantity of oxigen at the mean was therefore 49*55 cu- 

 bic inches. 



100:53 :: 49*55 : 26-26. 



Consequently 26*26 cubic inches of .carbonic acid gas were 26-26 cubic 



produced. inch carbonic 



acid gas produ- 



100 : 47*26 : : 26*26 : 12*41 grains. ced » 



12*41 :3'50 :: 100:28*20. 



Then, according to this experiment, 100 grains of carbonic !?8<S im f ng i 

 acid gas contain 28*20 of coal. 



Calculation by oxigen. 

 100 : 33*&2 : : 26*26 : 8*88 grains of oxigen consumed. 

 3*50 coal 



12*38 



Calculation by carbonic acid 12*41 

 by oxigen 12*38 



difference -03 



Here, contrary to what happened in other experiments, the or,from oxigen 

 calculation by carbonic acid rather exceeds that by oxigen : -2827. 



12*38:3-50 :: 100:28*27. 



Calculating therefore by oxigen, 100 grains of carbonic 

 acid contain 28*27 of coal. 



Experiment xcith Plumbago. 



Thermometer 44° Fahrenheit, barometer 29*94. Exp. with 



Four grains of plumbago, from a very fine specimen be- 4 grs# 



longing 



