382 III' Ann ricilli ( II nliKJixf . Dcf.-inlx-r. IK'.n 
l:ist .\il^il>t lu'lnrc tin- ( i(M)|()<iic;il Society of Aliicric;!. I sliow 
tli;it the \oliiiiii' of the drift contniiicil in the hist ict'-slifrt w iicii it 
was incited from these slates an<l jn'oviiice appears to have raiiiiod 
from very litth' on some tracts to the tliickiiess of at U>ast forty 
fc«'t on other ti-acts. ()ii tin- avcraire. I hclieve tliat it was not less, 
but prolialily consiiU'ralily more, tlian my estimate of its amonnt 
in New Hampshire, namely, the c(piivalent of a nniform sheet of 
drift six or sexcn t\-et thick. 
In (ireat JJritain. however, the material of the kames an<l other 
niodilii'(l drift is tlionoht liy Prof. -lames (leiUie to have Iteen de- 
ri\t'il almost whollv fi'om snli^lacial drift thronuh the action of 
streams tlowinj:; hcneath the icc-slu'ct : and he believes that there 
was very little en<rlacial drift, (piite too littU- to permit the en- 
glacial derivation of the stratitied drift which is alHrmed by Torell. 
Ilolst. and others in Sweclen. and by J)ana and many others who 
have stndied the drift of North America. IJnt another eminent 
Ibitisli uiacialist. Mr. (!. \\. liamplimh. in a very coini)lcte and 
valuable discussion of the drift dei)osits of Flamlioroiiiih Head 
and other })arts of Kiiiiland. pnldished this year, thinks that the 
ice-sheet which moved outwanl from Scandinavia an<l the hiath- 
lands of Scotland and northern Kiiiiland. swi-epinu' across the low 
area that is now the b(>d of the N<)rth Sea. and then eiicroachiiio; 
on the l-'laiiiborouiih coast, was charjicd with a large amount of 
euirlacial drift, not only Norwegian and Scottish boulders, but 
also marine debris with fossils, gathered iij) into the ice from 
liroiind that lia<l been previously and is again now the sea liottoin.'^ 
In thiscountry. we owe to I'rof. .James |). l)ana the earliest enun- 
ciation, more than twenty years ago. of the doctrine that the ice- 
^heet contained abundant drift and dcpositetl it during the linal 
melting, partly as unstratilied and partly as stratitied drift .t and 
oiilv a few years later this opinion was also published l»y |*rof. N. 
11. Winchcll. with es|»ecial emphasis on the ctfect of the superfi- 
cial melting to t-aiise this drift to become superglacial. :;; Hotli 
tlu's*' authors appear to claim that a larger proportion of the whole 
Aolumc of the drift was en<rl:u'ial at the close of the (Uncial 
-Quart. Jour. Geol. Society, T^oikIod, vol. xhii, ISlit, pp. ;js4-4ol, with 
maps and sections. 
+'rrai)s., Connecticut Aciuleniy of Arts and Sciences, vol. ii, 1S70, j^p. 
(U; fSli. Manual of (ieolo.^y, editions of tST4 and 188(t. 
:i:(ieolou"i("d and Natural History Survey of Minnesota, First Annual 
Itcport, for 1S?..\ p. (i2. Poi>. Sci.'Monthlv, vol. iii, 1S7:!, pp. :;>9:], 2'.«4. 
