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SCHREINEMA KERS 



ART. H 



the Figs. 7, 8, and 9. As we take T > T{e), we get the case of 

 Fig. 7. 



Fig. 9 



(iv) TiX) > T(W) > T = T(e) (case of Fig. 8). 



(v) T(X) > T(W) > Tie) > T (case of Fig. 9). 



12. We shall now deduce which phases and systems (phase- 



