ca 
GRRE AN See err 
Physical. Theory of Secular Changes of Climate. 438 
to the consideration and accumulation of facts from all parts of 
this country and the continent relating to Glacial and Inter- 
glacial periods, gives the following as the result of bis investiga- 
on 
“We note,” he says, “as we advance from Pliocene times, 
how the climatic conditions of the colder epochs of the Glacial 
they cease to return. The genial climate ofsInterglacial ages 
probably also attained a maximum toward the middle of the 
Pleistocene Period, and afterwards became less genial at suc- 
Cessive stages, the temperate and equable conditions of early 
Postglacial times being probably the latest manifestation of 
the Interglacial phase.” (‘Prehistoric Europe,’ p. 561.) 
I shall now quote the same author's description of an Inter- 
glacial Period as demonstrated by its flora and fauna. The 
reader must, however, observe that by Pleistocene Period, Pro- 
fessor Geikie means the so-called Glacial Period with its alter- 
nations of severe arctic climate and mild and genial conditions. 
