144 Scientific Intelligence. 
tation would inevitably propel it.” “In the Coast Range, the 
Uintahs, Wahsatch and the Park Mountains of Colorado, strata 
miles in thickness have sunk, and right at the upturned edges 
come up the towering granitoid mountains.” “ On the one hand, 
matter has been displaced and gone somewhere [southeastward], on 
the other, displaced matter stands revealed in immediate con- 
tiguity.” The Uintah range is a good example. “Disregardin 
the enormous Cretaceous deposits, the freshwater Tertiaries turne 
up on the flanks of these mountains are 10,000 feet thick. That 
these beds subsided by their gross weight as rapidly as they grew 
admits of no shadow of doubt.” “What became of the matter 
displaced by the sinking strata, and whence came the displaced 
matter which slopes down to their upturned edges, and how can 
the conclusion be avoided that they are one and the same?” In 
other words the granitoid core was extruded as the sinking went 
forward, or during the later part of it 
For further details respecting the theory we refer to the original 
memoir. 
With regard to this new theory, we might reasonably question 
the existence of the colloid magma—a condition fundamental to 
. . 
of which the rocks were made came from land once existing 
toa sinking by weight where the material was thickest above, 9 
so making the synclinals; whether in the case of the Appalachians, 
