300 0. C. Marsh—History and Methods of ' 
origin; of their use as medicine by the ancients, and in the 
East to-day; of their marvellous power as ¢ 
Romans, and still among the American Indians. It would be 
go 
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foot 
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ic 
wee student as having little connection with Geo 
_. uring the later half of the third period, greater gs 
was made, and before its close Geology was to a 
hd now bee gee eee 
__ ™ Essai géognostique sur le gisement des Roches, p. 41. 
n covered many times by 
