Studies in the Sierra 



231 



illustrating diagonal cleavage in granite; and Fig. 5 is a gable 

 on the south wall of the big Tuolumne Canon. It will be at 

 once perceived that the forms contained in Fig. 6 (a rock 

 situated near the small side-canon which separates El Capitan 

 and the Three Brothers, in Yosemite Valley), have resulted 

 from the partial development of both diagonal and rectangular 

 cleavage joints. At a, Z?, c, d, incipient diagonal planes are 

 beginning to appear on the otherwise solid front. Some of the 

 planes which have separated the two summit blocks, e and /, 

 may be seen at g. 



The greatest check to the free play and controlling power 

 of these divisional planes is the occurrence, in immense num- 



bers and size, of domes, 

 cones, and round wave- 

 ridges, together with an Fig. 6. 

 innumerable brood of modified forms and combinations. 

 The curved cleavage which measures and determines these 



