454 



PROCEEDINGS OF THE AMERICAN ACADEMY. 



and greater care exercised to keep the maximum pressure below the 

 freezing pressure. The data are given in Table III. ; the smoothed 

 values for each piezometer, the weighted means, and the final values 



TABLE II. 



Compressibility of Water at 0°. Comparison of Best Results with 

 Different Piezometers, Weighted Mean, and Final Values. 



in Table IV. The change of volume at any pressure is to be found by 

 combining with the value given by the formula 



where 



Av = ap + h})^, 

 Yoga = 5.5139 - 10, 



