S. W. Wood, Jun.— The Post' Glacial Period. 153 



so that it is traversed by simple curved veins converging at 

 the apex. But in Sciadopitys it appears from one of Zuccarini's 

 figures (t. 3, f. 7) that the dichotomy is not confined to such narrow- 

 limits as in Finns, and that consequently forked veins occur higher 

 up in the scale. This was to some extent apparently also the case 

 in the Solenhofen scales. 



Mr. Carruthers has named his species after the persons from whose 

 collections he has described them. I shall follow his example in 

 attaching the name of Haberlein to the species from Solenhofen. 



Araiicarites (Eutacta) Hdberleinii, Dyer, n. sp. — Strobili squamis 

 late obovatis vel subrhomboidalibus abrupte acuminatis, lepidio 

 brevissimo, nervis leniter curvis demum furcatis. 



I 



III. — On the Climate of the Post-Glacial Pebiod. 

 By S. V. Wood, Jun., F.G.S. 



T has been generally assumed by geologists that the climate of the 

 period which followed the elevation of the Glacial beds was one 

 of gradual amelioration from a rigorous to a mild one. The Eev. 0. 

 Fisher some time since, however, in describing certain appearances 

 presented by some superficial sections which he denominated "Trail," ^ 

 suggested that they were due to a second period of cold, w^hich he 

 regarded as having occurred between 100,000 and 200,000 years 

 back. Without adopting, in all respects, the views of Mr. Fisher, I 

 yet think that the facts, as far as yet known, point to the conditions 

 of climate during the Post-glacial period having been the reverse of 

 what has been generally assumed with respect to them ; and 1 pro- 

 pose here to give some reasons for that idea. 



1. The Geological evidence. — Speaking for the Eastern side of 

 England, as that which has more particularly come under my notice, 

 there seems to be an absence of any evidences of ice-action during 

 the emergence of the land from the Glacial sea. If masses of shore- 

 ice, such as now gather in wdnter round the coasts of Labrador and 

 Hudson's Bay, and even in the Gulf of St. Lawrence, had, during 

 this submergence, accumulated in the numerous inlets and channels 

 formed by the partially emerged rocky districts of the North of 

 England, and of Scotland, such ice travelling southward in summer 

 would, we might expect, have passed over the lower and therefore 

 not yet emerged country of East Anglia, and have plentifully be- 

 strewn it with some of those blocks that in millions cover the 

 surface of the Glacial drift of these rocky districts ; but I have 

 never met with a boulder in East Anglia whose presence may not be 

 traced to weathering from the Glacial clay beneath it, or to the 

 denudation from the place of its occurrence of Glacial clay in which 

 it was once embedded. 



This negative evidence is not, however, altogether satisfactory, 

 because, by a parity of reasoning, we should expect the surface of 

 East Anglia to have been strewn with similar blocks by ice that 



^ Quart. Joum. Geol, Soc, vol. xxii., p. 553 ; Geol. Mag., Vol. IV., p. 198. 



