— 
Ak Croll—Cause of Mild Polar Climates. 141 
tropical low ground skirting the main stream, so that both sank 
together into the same mud and silt.”* 
The elevated mountain regions from which he supposes these 
temparate forms were derived he thinks might have been Mull, 
miles N.N.W., and Wales 200 miles N.W. Mr. Gardner, 
however, showed most conclusively that Mr. Wood’s theory 
as based on imperfect acquaintance with the conditions of the 
problem. The following is Mr. Gardner's reply :— 
“The leaves have never been drifted from afar; they are often 
béen imbedded vertically. They are, moreover, not variously 
mixed, as they should be if they had been carried for any distance, 
forms of most temperate asepet are best preserved, so that to be 
jogicall i i i have 
' y applied, the Drift theory requires the palms, ete., to Da 
been drifted upwards. vt j 
miles from Wales, and spread out horizontally in thousands, with- 
out crease or crumple, on the coast of Hampshire, may be a feasi- 
Si Bia Mr. Searles V. Wood, Jr., but will not recommend 
Self to the majority of thinkers.” f 
Were there Glacial Epochs during the Tertiary A ?2—Many 
. g the Tertiary Age 
Beologists, especially susauigl those who are opposed to the 
* Geological Magazine, 1877, p. 96. + Geological Magazine, 1877, p. 138. 
