456 



PROCEEDINGS OF THE AMERICAN ACADEMY. 



extrapolation to a known zero. The values of the present work are, with 

 only one exception, lower than those of Amagat. The absolute value 

 of the discrepancy becomes less at the higher pressures, as it should, 



TABLE III. 

 Data for Compressibility of H2O at 22°. 



since the comparison with the present values is made under more 

 favorable conditions at the higher pressures. The fact that the ab- 

 solute value of the discrepancy tends to become less, not greater, 

 shows that the fundamental unit of pressure must be essentially the 



