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J. D. Dana — Dissected volcanic Mountain. 



This remarkable feature has been little appreciated notwith- 

 standing my report on the facts. 1 was recently gratified to 

 find that I could fortify my descriptions by means of outline 

 sketches of Orohena from my note-book of 1839, which have 



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Sketches of Orohena as seen on the ascent of Aorai. Orohena. the highest sum- 

 mit ; the other peak, to the left, Pitohiti. 



till now remained unpublished. The views were taken from 

 points toward the top of Aorai when on my ascent. They are 

 closely alike, but differ enough (because taken from points of 

 different elevation) to corroborate one another. They show no 

 horizontal lines and place the fact of their absence beyond 

 question. In that region of luxurious tropical growth, had 

 there been distinct bedding in the face of Orohena, unequal 

 erosion would have made recesses and projecting shelves, and 

 occasioned corresponding lines of shrubbery; and even if the 

 faintest horizontal divisional planes existed, the oozing out of 

 waters would have produced bands of green from the growth 

 of mosses and other vegetation. -But there were no shelves, or 

 bands. The surface in view was nearly bare of vegetation. 

 Such features are in striking contrast with those observed in 



