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PROCEEDINGS OF THE AMERICAN ACADEMY. 



The value of /7i o which was obtained from the least squares process 

 is entered in the above table as "arbitrary" because it is measured 

 from an arbitrary zero. This value of //i o was next subtracted from 

 each of the eighteen means, giving new values for these means on a new 

 scale whose zero is H wo . In other words, these means now represent 

 the true values of H — Hx 00 . The resulting values are given in Table 

 I, and are represented within their limit of error by the formula 



ff-H 100 = 0.3745 (t - 100) - 0.000990 (t - 100) 2 . 

 TABLE I. 



Values of H t — H l00 and of H t . 



This formula gives, in mean calories, the total heat of saturated steam 

 at any temperature between 100° and 190° C. in terms of that at 

 100° C. A value for the fundamental constant Hi W will presently be 

 chosen from those available in the literature of the subject, but it should 

 be remembered that even if this choice is wrong, or if new and different 

 data near 100° are hereafter published, whatever merit the above equa- 



