492 



PROCEEDINGS OF THE AMERICAN ACADEMY. 



is above —35°, however, so that this must now be tabulated as I-III. 

 He finds for I-II at -76°, 0.171 em.Vgm., and at -55°, 0.180. These 



■75 -65 -60° -55° 



-50° 



AE 



_ I 



-aS 



-8 2 

 -10 



5 -40° -35 -30° -25 



TEMPERATURE 



Figure 15. The latent heat and the change of internal energy when I 

 passes to II. 



values are considerably lower than the values found here. Tammann 

 appears to have overlooked entirely the correction for the thermal dila- 



TABLE XV. 

 Latent Heat, etc., on Equilibrium Curve Ice I-Ice II. 



tation of the fluid transmitting pressure ; the effect of applying this 

 correction would be to bring his values still lower. Tammann's results 

 do agree with the present ones in showing an increase in the change of 

 volume at higher temperatures, but Tammann finds a rate of increase 



