MAGNOLIA FAMILY 
“ The picture of the flight and dispersal of these forests, and 
of their struggle to find and adjust themselves to other homes, 
is second in interest to that of no other migration. A single 
GYMNO- ANGIO- 
Bea Hee SPERMS SPERMS 
FORMATIONS 
Conifers| Cycads MMetena | ledont 
quaternary |" 
Chea Easel 
Pllesene 
TERTIARY iitoeene 
Eaive 
Coban 
MESOZOIC Jurassic 
Teese 
Cuibonteweis 
PALEOZOIC Davenian 
Slides 
ARCHAAN | 
Chart Showing the Development of Vegetation during the Geological Ages. 
tree is helpless before such a force as an advancing glacier, 
since a tree alone cannot migrate. But a forest of trees can. 
Trees can “take to the woods” when they can do nothing 
8 
