HABITATIONS AFFECTED BY ENVIRONMENT. 



475 



themselves from invasion ; moreover that the oldest form of building- 

 known to them was therefore an inclosure of lava-stones, whence the 

 application of the contraction he sho ta and its restriction to mean a 

 walled inclosure. 



Cftf^ 



Fig. 492— Han of Pueblo structure of lava. 









iiirafli 



Fig. 493.— Section of Pueblo structure of lava 



RECTANGULAR FORMS DEVELOPED FROM CIRCULAR. 



It may be well in this connection to cite a theory entertained by Mr. 

 Victor Mindeleff, of the Bureau of Ethnology, whose wide experience 

 among the southwestern ruins entitles his judgment to high consider- 



