BRIDGMAN. — WATER UNDER PRESSURE. 



507 



tends to —21°, 4° into the region of stability of III. It is known, how- 

 ever, that it is possible to extend the curve as far as —25°. On one 

 occasion a point was found here, but it is not sufficiently accurate to 

 plot, owing to defective temperature control. The behavior at the 

 upper end of the V-L curve is the exact opposite of that at the lower 



-J 



H.080 



r.070 



III 



O.060 

 111 



o 



Z 

 < 



X 

 o 



.050 



-20' 



-10" 



0' 



TEMPERATURE 



Figure 25. The change of volume when V passes to the liquid. 



end. It was not found possible to prolong the equilibrium curve of 

 V and L the slightest distance into the region of stability of VI, V 

 always passing spontaneously into VI. This was tried several times ; 

 the reaction runs if the penetration into the VI region is even as slight 

 as 1°. 



More or less trouble was found in determining the change of volume. 

 When kerosene was used as the transmitting fluid, there seems to be 

 some action below 0°, either between the water or the ice and the kero- 



