CONCLUSIONS. 



67 



100 A 



100 A a 



100 A b 



IV 



100 B 



I 



a b 100 G 



100 B 



100 A 



100 B 



100 A 



100 B 



100 A a b 



Fig. 20. 



100 B 



accompanying phenomena like viscosity and undercooling. If a liquid 

 mixture of composition a undercools to e before crystallization begins, 

 crystals of composition e will appear and no others (provided the re- 



