163 



both reach their northern limits in southern Newfoundland and 

 the Ilex in Nova Scotia, and that all except the Populus extend 

 at present far to the southward of the Maine region. It would 

 seem therefore that a glacial front below sea level as in the case 

 of the Newington moraine farther south would not have been 

 favorable for the development of vegetation unless it is assumed 

 that the climate had already become warmer and the glacier 

 had become covered with vegetation as is the case with some of 

 the present Alaska glaciers. This is a possible explanation but 

 it mvolves genial conditions extending over a number of years, 

 during which it would seem as if ice melting would be rapid and 

 the predicated mantle of soil on the glacier would be disturbed, 

 moreover the species found fossil are not the types that would 

 be at all likely to grow in such situations. On the other hand, 

 bearing in mind the sort of contacts between the marine clay 

 and the glacial materials, as described by Professor Little and 

 his interpretation of the history of the Waterville region, the 

 explanation that accords precisely with the facts observed would 

 demand the retreat of the ice from this region, the introduction 

 of vegetation from the south and the continued but diminishing 

 presence of valley ice the melting of which furnished the cold 

 water that enabled the marine fauna to continue its existence 

 in these estuaries. If this is the true interpretation of the 

 succession of events then the marine deposits at Waterville 

 would be somewhat younger than the late Wisconsin clays in 

 front of the Newington moraine and would constitute the closing 

 event in the Pleistocene history of the Waterville region, assuming 

 that a division can be made between what is commonly called 

 Pleistocene and Recent. 



SHORTER NOTES 



SCLEROTINIA AND BoTRYTis. — Connection has recently been 

 established between an apparently undescribed species of Sclero- 

 tinia occurring in woods in the upper end of Van Cortlandt 

 Park on the rootstocks of wild geranium and a species of Botrytis 

 occurring on the roots and rootstocks of the same host. The 



