SPREADING OF THE OTHER ANIMALS. 89 



line. Winged insects, however, pass sometimes 

 beyond the snow-line. Humboldt and Bonpland 

 saw insects in the snowy regions of Chimborazo ; 

 and Saussure met with some on the snowy re- 

 gion of Mont Blanc. As some winged insects 

 live but a very short time, and become stiff with 

 cold, without dying, it is easy to conceive why, in 

 cold countries, as in Greenland and Lapland, several 

 insects exist. According to such observations, the 

 line of the extension of the insects has been drawn 

 2 beyond the snow-line. 



3. How far Crabs and Shell-Fish are diffused, 

 cannot be ascertained : but they probably are met 

 with on the Southern Hemisphere, beyond the 

 80th degree of latitude, being food for Whales. 

 According to Crantz, there are a great number of 

 Crawfish and Squills in Greenland. 



4. The Snails and Worms of the main land and 

 fresh water are not diffused beyond the snow-line, 

 as they are unable to live there : how near they 

 approach to it cannot be ascertained ; yet some of 

 them are of a tenacious disposition, and are more 

 numerous in the Temperate than in the Torrid 

 Zone. The line of their spreading has been accord- 

 ingly drawn up to the 3d degree on this side of the 

 snow-line. 



