intermediate; feldspars. 



43 



Time Curves. 

 (In microvolts as observed). 



An. 



MV. AF 



5050 

 5206 



534i 

 544i 

 5526 



5594 

 5650 

 5697 



5738 



5773 

 5802 



5829 

 5853 

 5875 

 5891 

 5906 

 5920 

 5933 

 5945 

 5956 

 5965 

 5974 

 5983 

 5992 

 5998 

 6004 

 6012 

 6020 

 602S 

 6033 

 6040 

 6048 

 6056 

 6064 

 6071 

 6078 

 6087 

 6099 

 6110 

 6122 



6i34 

 6149 

 6163 

 6181 

 6197 

 6213 

 6232 



156 



135 

 100 



85 

 68 



56 

 47 

 4i 



35 

 29 



27 



24 

 22 



16 



15 



14 



13 



12 



1 1 



9 



9 



9 



9 



6 



6 



8 



8 



8 



5 



7 



7 

 7 

 9 

 12 

 1 1 

 12 

 12 

 15 



14 

 18 

 16 

 16 

 19 



At^An.,. 



MV. AV 



13530 

 13830 

 14130 

 14370 

 14560 



I47I3 

 14838 

 14942 

 15028 

 151OI 

 15164 

 IS2I8 

 15264 



15303 

 15339 

 I537I 

 15398 

 15423 

 15447 

 1546S 

 15488 

 15504 

 I552I 

 15537 

 15552 

 15567 

 i558i 



15594 

 15608 

 15622 



15637 



15654 

 15672 



15695 

 15733 

 15796 



300 



300 



240 



190 



153 



125 



104 



86 



73 



63 



54 



46 



39 



36 



32 



27 



25 



24 



21 



20 



16 



17 

 16 



15 

 15 

 14 

 13 

 14 

 14 

 15 

 17 

 18 



23 

 38 

 63 



AbiAn.. 



MV. AF 



1 1700 



I22IO 



12655 

 I296O 

 I3236 



1 344 1 

 13595 

 13722 



13832 

 13932 

 14022 

 14107 

 14186 

 14256 

 14323 

 14393 

 14456 

 I45I4 

 I457I 

 14620 

 14670 

 I47I4 

 14759 

 14797 

 14839 

 14877 

 14912 



14947 

 14982 



1 501 3 

 15046 

 15082 

 15118 

 15160 

 15211 

 15306 

 I54I9 



5io 

 445 

 305 

 276 

 205 



154 

 127 

 1 10 

 100 

 90 

 85 

 79 

 70 

 67 

 70 

 63 

 58 

 57 

 49 

 50 

 44 

 45 

 38 

 42 

 38 

 35 

 35 

 35 

 3i 

 33 

 36 

 36 

 42 

 5i 

 95 

 113 



AbjAri!. 



MV. AI/ 



134OO 

 13489 

 13573 

 13647 

 I37I5 

 13778 

 13836 

 13891 

 13942 



I399 1 

 14038 

 14083 



14*25 

 14166 

 14206 



14245 

 14284 



14323 

 14363 

 14402 



14444 

 14488 

 14538 

 14605 

 14676 



89 

 84 



74 

 68 



63 



58 

 55 

 5i 

 49 

 47 

 45 

 42 

 4i 

 40 

 39 

 39 

 39 

 40 



39 



42 

 44 

 50 

 67 

 7i 



Ab^Ari! 



MV. A]/ 



2480 



2533 

 2590 

 2648 

 2701 

 2752 



2797 

 2840 



2881 



2917 

 2952 



2987 

 3020 



3053 

 3088 

 3121 



3154 

 3184 

 3215 



3248 

 3283 

 3318 



3355 

 3388 



342i 

 345i 

 3483 

 35i6 

 3547 

 3576 

 3602 

 3627 

 3648 

 3664 



3675 

 3696 

 3724 

 3758 

 3794 

 3833 

 3873 

 3914 

 3954 

 3998 

 4050 



53 

 57 

 58 

 53 

 5i 

 45 

 43 

 4i 

 36 

 35 

 35 

 33 

 33 

 35 

 33 

 33 

 30 

 3i 

 33 

 35 

 35 

 37 

 33 

 33 

 30 

 32 

 533 

 3i 

 29 

 26 



25 

 21 

 18 

 1 1 

 21 

 28 



34 

 36 

 39 

 40 

 4i 

 40 

 44 

 52 



Ab 3 An,. 



MV. A V. 



2754 

 2793 

 2834 

 2877 

 2916 



2954 

 2989 

 3022 



3053 

 3082 

 3109 



3134 

 3160 



3184 

 3207 

 3229 



3250 

 3270 

 3288 

 3306 

 3321 

 3337 

 3354 

 3373 

 3393 

 34!5 

 3439 

 3466 



3493 

 3520 



3548 

 3576 



39 

 4i 

 43 

 39 

 38 

 35 

 33 

 3i 

 29 

 27 

 25 

 26 



24 

 23 

 22 

 21 

 20 

 18 

 18 



15 

 16 



17 

 19 

 20 



22 

 24 

 27 

 27 

 27 

 28 

 28 



The numbers represent the electromotive force of the thermo- 

 elements at intervals of one minute, together with a column of dif- 

 ferences at the right of each record. The B. M. F. will be seen to 

 approach a minimum as melting progresses and to increase again 

 when it is complete. This minimum rise in the temperature, of course, 

 indicates the maximum absorption of heat. For purposes of rough 

 orientation 10 MV may be considered equivalent to one degree. 



