WATER 



39 



increases with decreasing temperature, a somewhat unique phenome- 

 non. There is no doubt that the anomaly is connected with the anoma- 

 lous temperature coefficients of other properties of water, and may be 

 supposed to be due here also to the increasing presence of a more 

 bulky polymer at lower temperatures. With the help of the table given 

 on page 269 of the admirable book of Landolt and Bornstein (1894), 

 it is easily possible to make an approximate correction for temperature. 

 Corrected in this way to 20 , and also transposed from the u atmo- 

 sphere " to the metric unit, some of the values found for the compres- 

 sibility of water are given in the following table : 



Thus our result accords closely with the higher value found by Tait 

 and with the results of Pagliani and Vicentini, Avenarius, Grinaldi, 

 Schneider, and Rontgen and Schumann. It is somewhat higher than 

 the values found by Drecker and Amagat, and the second value found 



by Tait. 



Compressibility of Water. 



Comparison of Work by Different Experimenters. 



The close agreement of our value (44.3) with that accepted as the 

 most probable [46.09 (1000/1033) = 44.6] by Landolt and Bornstein 

 (1S94, page 269), is very satisfactory, especially since the slight dif- 

 ference of less than one per cent, is probably due to the low pressures 

 used in obtaining: the higher of the two results. 



The agreement is close enough to show that the measurement of 

 pressure the least certain part of our determination must have 

 been essentially correct. This conclusion affords valuable verification of 

 the present measurements of all the other substances as well as of water. 



The Heat of Compression. 



It has been already shown in the early part of this paper that the 

 heating of the compressed material causes a thermal expansion so great 

 as to cause the first breaking of the galvanic current in the jacket to 



