OF ARTS AND SCIENCES. 



17 



TABLE VI. — CO.,. Second Seri-es.— Continued. 



Measurements 39 to 98 furnish data for comijuting the constants 

 in an empirical equation for carbonic acid, and the equation thus 

 deduced is 



— = 1 + 0.003725 1 — 0.00000264 f + 0.00000000417 <3 



between the limits of 0° and 224° C. 



The term containing (^ is necessary on account of the rapid curvature 

 of the line representing the observations. The last column of Table 

 VI. shows the values of — = — deduced from this equation for the 



temperature means of the second column, showing as close an acree- 

 ment with the observed means of ^ as could be expected except at 



100°, where the deviation amounts to about two per cent. The first se- 

 ries is however of much less weight than the second series. The last 

 column of Table VI. shows tlie values of — computed to corrcsi)ond 



with the means of the preceding column. The average deviation of 

 the observed means from those computed from the above equation is 

 thus 0.0020 or about 0.15 per cent. The average deviation of the 

 individual results from their corresponding means, taken as in the 

 fifth series for air, is 0.0052, or about 0.4 per cent. 



VOL. XXI. (n. 8. XIII.) 2 



