high altitude, an opposite result has apparently been produced. The 
relatively dry and warm conditions of the present have changed 
lands which once were too cold for the practice of agriculture into 
places where large numbers of people can live in comfort by means 
of that pursuit. Thus there appears to have been a change in the 
location of the regions best suited to human occupation. The change 
THE SECRET OF THE BIG TREES. 
5.** f *f 
and of the countries around the Mediterranean Sea appears to have 
changed. On the whole the climate seems to have grown drier, so 
that regions which once were fertile have now become desert. Far¬ 
ther north, however, or in regions which are cold and damp because of 
BASE OF GRIZZLY GIANT, MARIPOSA GROVE, YOSEMITE NATIONAL PARK. 
Photograph by Pillsbury Picture Co. 
