ALTITUDE OP THE EARTH. 



from South to North. It is this varying- line of snow 

 which intimates to birds of passage their time of 

 migration. 



This variable line of snow forms, in the direction of 

 the Meridian, a similar curve to that which the earth 

 describes when revolving round the sun ; viz. an 

 ellipse : being closely connected with the action of 

 the earth which occasions the seasons. 



ALTITUDE OP THE EARTH. 



In the five parts of the globe, there are detached 

 mountains as well as continuous ranges, which are 

 elevated above the perpetual limit of snow. In our 

 Picture, the chains of mountains and single mounts 

 are delineated according to their true degree of lati- 

 tude, together with their known heights. The lofty 

 mountains of Asia occupy the back ground : imme- 

 diately before them is the range of the Andes in 

 America, running from North to South ; and re- 

 markable for having considerable altitudes in both 

 Hemispheres. Before them appear the European and 

 African mountains ; the former being separated from 

 the latter by the Mediterranean Sea, which is repre- 

 sented in the Picture as existing at the foot of Mount 

 Etna. The African mountains are characterized by 



