22 Where did Life Begin? 



now too cold, for such life as inhabits the 

 warmer parts of the earth, these now colder 

 parts, in passing from the extreme of heat to 

 the extreme of cold, must have passed slowly 

 through temperatures exactly suited to all 

 plants and all animals in severalty which now 

 live or ever lived on the earth. 



Sixth. — If the concurrent conditions which 

 have usually followed lowering temperature 

 followed the climatic changes in this case, life 

 did commence on the earth within one or both 

 of certain zones surrounding the poles, and 

 sufficiently removed therefrom to receive the 

 least amount of sunlight necessary for vege- 

 tal and animal life. 



It seems almost superfluous to say that 

 those parts of the earth which first became 

 cool enouQ-h to maintain life had a climate 

 warmer at that time than that which we now 

 call torrid. It was for an epoch, and probably 

 a very long one, as hot as it could be and 

 maintain life. 



It is also quite obvious, in the light of the 

 foregoing considerations, that as the temperate 

 zones have always received more heat from the 



