Fig. 22. 
Fig. 23. 
run at smaller volumes (for equal #) than v = 5, and have there- 
fore no physical signification. 
3°! Case. If the a-line is shifted still more to the left, we obtain 
fig. 11 with minimum critical temperature, the case fully discussed 
in the preceding communications. As soon, however, as the minimum 
of a has got on the left of that of 4, we are in the 4" case. 
