Show structure ot of yoshito rock bock already y I 1 observe two very distinct kinds of structure in tile the granite grUl lite of thi this i region m bich singly or combined determine all tile the forms about this wonderful valley the theo c two kinds of structure L we arc the concentric structure on oil nn an ill most L inconceivably grand scale and alrude a rude columnar cluie tui e or ilso also on oil a stand grand scale the and in d exfoliation of the granite canite ra nite massai of tile the concentric COneen structure give faive rise to the bald rounded founded domes tile the tnie itself is well seen in ill sentinel dome and especially pecia ally in the e royal arches tile the columnar structure by di disintegration in te ration gives rise rise to washington 1 column I olun ill fin and the sharp peaks like sentinel it tock and in cathedral spires I ires both these structures exist in in the same saine gra goranites grini tc though the one or the other may pi predominate ill fit all the rocks about there is a tendency to cleave in concentric t lie layers layer s giving ivin IM rise to dorne dome like forms both I 1 are well seen combined in ill tile lie 0 grand aina mass in ass of half dome DODIC the perpendicular face well of this dome is the insult of the perpendicular cleavage whatever may be our theory of the formation of yosemite charni and thi the perpendicularity of its cliffs we must not leave leare out of view vieu chiq teri tendency deLcy to perpendicular cleavage I 1 observe ye to ano 0 that the granite gra Q heru Is is very coarse se graines and disintegrates into dust with cicat it rapidity pi cliot of joseph lie le conic |