CAUSE OF MILD POLAR CLIMATES. 175 



date of the " Flysch " of the Eocene formation, and the 

 latter the date of the period when the Miocene erratics 

 were deposited in the icy sea near Turin. 



Some geologists have maintained that the climatic 

 conditions of the Tertiary period are utterly hostile to 

 the Physical Theory of Secular changes of Climate. 

 The very reverse, however, is the case ; for, as we have 

 seen, several of the facts of Tertiary climate can be 

 explained on no other principle than that of the 

 theory. 



