560 PHYSICAL GEOGEAPHY. Book III. 
Coppermine Mountains, the group at the source of the 
Gila and the Sierra Blanca, from the system of the great 
Sierra Madre in the most defined manner. 
IX. — From the above it is evident that, to connect the 
Rocky Mountains with the Great Sierra Madre is a com- 
plete misconception of the orographic basis of the whole 
physical geography of the North American Continent. 
This erroneous conception makes the western border of 
the southern half a continuation of the eastern border of 
the northern half of the great longitudinal basin on the 
western side of the continent. In this manner the ana- 
logous elements of its physical geography are separated, 
heterogeneous ones are brought together, and the great 
foundations of climatology are put into confusion as well 
as those of the distribution of vegetable and animal life. 
