304 PEOFBSSOB TYOTALL Olf THE TEI^-ED SIErCTtEE OE GIACIEES. 
constituted the bed of an ancient neve ; and the_ groo^gs “^tdS'gradtl'Sd 
summU of P^ss, ^"frienrProfessor Eaaisat. and assisted by his 
"Ct f dshlLlites of let ancient ndvds, and found the sante ttue ot 
all of them; they all slid more or less over then e s 
No investigator of g^aer — ^ caf.. trae; and 
them then proper weight The sMm »« y S 
many of the objections raised against it, and stiii lepeaiea 
tletelwlfind that the extreme facts have been dwelt upon prind- 
• A ’;i icip-nt truths have by partial treatment, been rendeied 
C^;4t oZ ^*.1, -in “■>" 
appaien y i, , 4 . -f pnnallv true that it slides over its bed. 
by pressure like a plastic mass, but 9. y 
§ 12 . On the Dirt-hands of the Mer de Glace. 
In walking over the Mer de Glace, we soon obseiwe differences in 
in wauii ^ ^ .taudinsr on the glacier itself, no ordeiU aiiange 
the dirt upon its surface ; but while stand g g however, which com- 
ment of the dirty and clean spaces is observed. Fiom a PO-“y - 
mands a view of a large portion of ^y^fopow each ither in sue- 
:rofdown the glacier. They were first observed f 
heights of Charmoz, on the 24th of July, 
'"Sion'Ld Stefw^h th"r observed by Professor PoaBns. This .agree- 
ment, °Ster an interval of sixteen years, pr^es “d ' 
These bands were different from anythmg ° Hcxlet andmvself 
felt that the explanation given of the “ dirt-bands by ^ 
would not completely account for those now before . y P • 
from each other, and resembled sharp hyperbolas with then leitices poii , 
most visitors to the Montanve .1 rp-i rhino- bv the fire of stones 
page 84 of the iraveis, ana vv n summit 
which a secondary glacier sent down upon hi . 1 j Fm. 23 
r however, infer tLt he or some of his guides must have reached the pkice. F.„ 
represents what I observed from this excellent station. descends which is 
From the base of the AiguUle du Geant -d the d-enades, a B“esce^^^^^ ^ ^ 
separated by the Aigmlle and promontory o a between botlp beside which 
descends from the Col du Geant. A small moraine is formed between , 
