88 PICTURE OF ORGANIZED NATURE. 



thence to the Torrid Zone. As the snow-line of 

 the sea, however, begins in a higher degree of lati- 

 tude than that of the main land, the Marine Fish 

 approach much nearer to the Poles than those inha- 

 biting fresh water on the main land are enabled to do. 

 The Alpine Trout (Salmo Alpinus) according to Wah- 

 lenberg, is not met with further than 2100 feet below 

 the snow-line in Lapland, nor is any fish to be found 

 in a higher latitude. The Gwiniad, or Dace (Salmo 

 lavaretus), and the Grayling (Salmo thymalus), are not 

 found more than 3 150 feet below the snow-line. This 

 accords with Humboldt's observations, who, with Bon- 

 pland, did not find any fish in the lakes of Chimborazo 

 at a height of 17500 feet. According to such obser- 

 vations, the line of the spreading of the fresh-water fish 

 has been drawn as far as 70 on this side of the 

 snow-line. The snow-line of the sea lies more than 

 5 nearer the Pole ; and fish spread as far as the 

 water runs : at least they are met with about Spitz- 

 bergen. The line of the spreading of the Marine fish 

 has been, on that account, drawn about 5 beyond that 

 region where, on the main land, the snow-line lies. 



2. The limit to the spreading of Insects can- 

 not be ascertained. Most of them, and the hand- 

 somest and largest, are found in the Torrid Zone ; 

 and their native country lies not beyond the snow- 



