Speedy Volumetric Determination of Carbonic Acid, 193 



Fourteenth Analysis. 



Volumetric method 2'516 



By Pettenkofer's method ... 2-508 



Difference 0-008=0*3 per cent. 



Fifteenth Analysis. 



1st— Volumetric method 2'808 



2nd „ „ 2-783 



Mean 2795 



By Pettenkofer's method 2- 788 



Difference 0-007= 0*25 per cent. 



Sixteenth Analysis. 



1st — Volumetric method 2'935 



2nd „ „ ... 2-939 



Mean 2'937 



By Pettenkofer's method 2*939 



Difference 0*002=0-077 per cent. 



Seventeenth Analysis. 



Volumetric method 4" 392 



By Pettenkofer's method 4*390 



Difference 0*002 =0*04 per cent. 



Eighteenth Analysis. 



1st— Volumetric method 0*9327 



2nd „ „ 0-9412 



Mean 0'9369 



By Pettenkofer's method 0-9327 



Difference ' 0-0042=0*43 per cent. 



These eighteen series of analyses illustrate the results to be obtained 

 by the use of my instrument. 



The temperatures of the bell- jars are easily read to a fraction of the 

 tenth of a degree Fahr., and the three corrections for temperature take 

 no time to make. By waiting till the temperatures in the bell-jars, 



