CRYSTALLIZATION OF SEPULCHRE MOUNTAIN ROCKS. 131 



ness. The rock shown in PI. XXII, fig 1 . 1, belongs to grade 2, being 

 microlitic glass. ■ In the dacite shown in PL XXII, fig. 2, the grade of 

 crystallization is 9 ; and in the dacite shown in PI. XXI, fig. 2, it is 19. 



Table XIII. — Grades of crystallization of the eruptive rods of Sepulchre Mountain. 





B„ B 2 , D„ D 2 . 



B31 Bi- B 5 , D 3 . 



D 4 , D e , D 6 . 



D„ D„, D 9 . 



D,„,r>,„D„. 



1... 



394,396 



416. 









2... 



385, 386, 387, 388, 

 397, 398, 421, 

 422, 423, 427, 

 428. 



401, 405, 417 



459. 







3... 



390, 391, 392, 393, 

 400, 429. 



402, 403, 406, 407, 

 409, 410, 411, 

 412, 413, 418, 

 431, 432, 433, 

 434. 









4... 





404,414,415, 419, 



443,460,461,474.. 



476. 









420. 









5 







445, 462, 463 

 446,464,465 



481, 482, 496. 

 477,484,485 



498, 508, 509. 



6... 



424 



436, 437, 439 



7 



425 



466,467,468,475.. 



486,487 



499, 510, 511, 512, 

 523. 

















447, 448, 449, 470, 

 471,472,469. 



478,488,489,490.. 



500, 501, 502, 503, 

 513, 514, 515, 



















516, 517, 524, 













525. 



9 







451, 452, 453, 454. 

 455. 



491,492,497 



504,518,519. 









10... 













11 











526. 



505, 527. 



12 





440 





479, 480. 











14... 

 15... 



426 



441 





493. 









16 







458 



494. 





17... 



















520. 



506, 507, 521, 522. 











495 



20.. 





442. 







21... 





22... 













23... 













24... 













25... 



430. 











