TEE CAUSE OF THE GLACIAL PERIOD. 531 



of these moraines, coupled with what may jet be learned 

 concerning the nature of ice and concerning the shifting 

 course of the atmospheric currents, will, in all probability, 

 eventually furnish the data for the solution of the question 

 of the true cause of the Glacial period. A fair field here 

 invites the active and prolonged attention of some future 

 meteorological Darwin or Newton, and promises immortality 

 such as they have attained. 



