396 
PERU 
CHAP. XVI 
speculations, however, must be vague ; for who will pretend to 
say that there may not have been several periods of subsidence, 
intercalated between the movements of elevation ? for we know 
that along the whole coast of Patagonia there have certainly 
been many and long pauses in the upward action of the 
elevatory forces. 
HUACAS, PERUVIAN POTTERY. 
* 
