In North America, at least, Pleistocene 

 history must be interpreted anew; in Eu- 

 rope it is being reinterpreted and we may 

 congratulate ourselves that it is the field- 

 botanist who is able to lead the geologist 

 into clearer paths. The two sciences must 

 draw closer together; until they do both 

 the historical geologist and the plant geog- 

 rapher will continue to work in unnecessary 

 darkness. — Merritt Lyndon Fernald. 



