508 



PROCEEDINGS OF THE AMERICAN ACADEMY. 



sene. This results in a slight rounding off of the corners of the dis- 

 placement-pressure curve, so that the actual discontinuity is difficult 

 to determine. This would point to a solution of the water in the 

 kerosene. The rounding off of the corners is not enough to affect 

 appreciably the equilibrium pressure. The effect was on the whole 



TABLE XXIII. 

 Latent Heat, etc., on the Equilibrium Curve, Ice V-Water. 



less marked when gasolene was used as the transmitting fluid. The 

 change of volume points are given in the same table with the equi- 

 librium points and also in Figure 25. All the data before February 10 

 were obtained with kerosene as the transmitting fluid ; gasolene was 

 used for the results obtained afterwards. The gasolene points are on 

 the whole better, although the difference here is not sufficient to have 

 necessitated the use of gasolene instead of kerosene. The changes of 

 volume VI-L are much more affected by the transmitting fluid, below 

 zero, than are the changes V-L. The first two values of November 11 

 and 14 are not plotted, since the design of the apparatus in the first 

 few attempts was not good. Small portions of the water were likely 

 to separate from the rest after a single freezing, so that unless the 

 pressure was carried considerably beyond the freezing pressure, part 

 of the water was likely to remain liquid, giving too low an apparent 

 change of volume. The lowness of these first two points is to be 

 explained in this way. 



Within the limits of error, the relation between temperature and 

 change of volum.e is linear. The lower end of the curve is about 1 per 

 cent higher than what would be demanded by the points themselves. 

 This was made necessary by the conditions at the critical point. 



