428 K T. Allen, F. K Wright and J, K. Clement— 



Table. XII (see fig. 16). 



Monoclinic 

 Time. pyroxene. Amphibole. 



min. 15000 15000 



10920 10600 



1 " 343 170 



890 825 



2 " 11570 11625 



12210 12380 



3 " 740 995 



13180 13490 



4 " 520 840 



815 14120 



5 " 14040 332 



223 500 



6 " 360 • 630 



476 739 



7 " 559 795 



627 818 



8 " 678 830 



720 841 



9 " 751 850 



778 860 



10 " 798 868 



811 876 



11 " 825 884 



838 891 



12 " 849 897 



857 903 



13 " 863 908 



871 913 



14 " 877 917 



883 921 



15 " 888 924 



893 928 



16 " 897 931 



905 933 

 3 7 " 909 937 



913 940 

 18 " 916 942 



Table XIII (see fig. 17). 



Monoclinic 



Time, pyroxene. Enstatite. 



min. 15800 15800 



12100 12380 



1 " 11160 140 



700 670 



2 " 12325 13200 



940 690 



3 " 13410 14065 



805 370 



4 " 14115 615 



375 820 



5 " 584 980 



768 15115 



6 " 915 215 



15048 295 



7 " 152 352 



242 394 



8 " 312 428 



372 455 



9 " 418 476 



458 495 



10 " 489 510 



515 523 



11 " 536 533 



557 543 



12 " 572 551 



588 558 



13 " 601 565 



612 573 



14 " - 623 580 



631 587 



15 " 639 594 



647 600 



16 " 654 606 



661 612 



17 " 666 616 



672 623 



18 " 678 628 



631 



with all the precautions which we have prescribed. The 

 curves for both the enstatite and the amphibole lie to the 

 left and above that for the monoclinic pyroxene. They 

 therefore change into the latter with evolution of heat, and 

 hence are monotropic with respect to it. The curve for the 

 orthorhombic amphibole lies outside that of enstatite, and 

 consequently the exothermic change is quantitatively greater 



