J. Wharton on Autumnal Foliage. 251 
volcanic accumulations. At Cuenca, south of Chimborazo, 
metamorphic rocks abound. On the east slope of the eastern 
Cordillera mica-slate i is the prevailing rock. The ‘ ee 
8 of gypsum” seen in Chili are ane Tn in Ecuador. A 
dolomite marble occurs near Ca 
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asi, six mi es from 
ito, teeth of the Mastodon ea nai ?) have been found ; 
and in the ravine of Chalan seven miles south of Riobamba, 
we rong the femur and patelle of a Mastodon, the sk 
ot a Horse, and numerous leg-bones not yet identified. They 
were itibedded in the middle of a cliff (200 ft. high) of the 
compact tenacious clay resulting from the union of trachytic 
es with water, and were cere with terrestrial shells, 
identical with living s ecies in the vicinity. The bones were 
PE Wis oe SMO gs te eS Fe ee 
_ the probable climate and the character of the ve septation in 
“us high valley, when these extinct mammifers lived.* 
Rochester, N. ¥., Nov. 10th, 1868. 
—— 
Arr. XXT. Scns ten upon Autumnal Foliage; by 
JOSEPH WHARTON. 
Sahoo the green coloring matter of leaves, should be, 
like many other greens, a compound color, it must have for one 
of “i, elements a vegetable blue, capable of being reddened by 
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be ought to fonomd Bins again, "wide exposed to an alkali ; or, in 
_ other words, if green leaves should be reddened in the autumn 
i the manner here suggested, by the unresisted action of the 
if mate ote Deng met ‘hey ought to return from red to gre 
i . iio eas Gas ts athe of the South 
‘of Eeuador, we? br. Dr. gs Wagner, in the Berlin Ze’ 
Erdkunde, xvi, 232, 1 
