42 Where did Life Begirt? 



cept on a straight line drawn between the 

 two places where their remains are found, the 

 aggregate distance of their travels must have 

 been farther. 



Apply this principle to the case of the sev- 

 eral remains of plants of the same species 

 found in the coal-beds of the Arctics and 

 those of Pennsylvania, and It follows, first, 

 that the whole distance between these widely 

 separated coal-beds, at the least calculation, 

 has In a tribal sense been travelled by as 

 many species ; second, that If the Pennsyl- 

 vania plants did not come from the Arctics, 

 then Arctic plants must have come from Penn- 

 sylvania, or some other locality warmer than 

 the Arctics (for all other localities except the 

 Antarctics are and always have been warmer), 

 to inhabit a territory the climate of which was 

 at a previous period precisely adapted to them, 

 but at the time of their comingf was far too 

 cold, unless the locality they came from was 

 as much too warm, or unless the earth was 

 formerly heated In a method or from sources 

 so radically different from the present that the 

 polar regions and equatorial belt had the same 



