566 AMERICAN ASSOCIATION 
region, speaks of these lines of boulders as osars. Sir Charles Lyell also 
supposing a depression, thinks these boulders were transported by coast- 
ere being no evidence of any eerie depression of this part of 
the continent during the Glacial Period, even if a submergence would 
afford an adequate opti which it rane not, how are we to account 
for these boulder-tr. 
As the vast ice- Bee which spread over the country gradually wasted, 
the FEL din from which these boulders were derived would be at last 
laid bare. 'The ice no longer passing directly over the tops of the hills, 
here is eirik that the mass was parted, moving around the north- 
septum. and South: westers sides of the several peaks. Of course, under 
h 
n thickness, and continuing to thaw, the boulders would be carried for- 
ward for some dett and finally left above the typical drift, as we now 
d As the ice wasted there would be changes in the direction of 
the moving mass, determined by the character of the un nderlying surface 
of solid rock, thus I us to account for the variation in the course 
of the boulder-tra 
Such, in brief, is Bd explanation suggested for these trains of angular 
o 
Professor ORTON presented a paper ‘On the Evidence of a Glacial 
Epoch at the Equator,” geriet controverted Professor Agassiz's theory of 
the glacial origin of the Amazon Valley. He briefly reviewed the state- 
The o 
si and plainly siiis that side toni of the Amazon, like the Pampas 
Plata as shown by Darwin, is an estuary creation, or the relic of à 
