232 NOTES AND NEWS. 
into shales, and these, by slow degrees, into shales more and more 
calcareous until, eventually, they pass into pure limestones. 
This will serve to explain the predominance of deep-sea limestones 
over deposits of terrigenous origin as the Yoredale Rocks are 
followed from the north-west south-eastward. It would also lead us 
to expect that, as these rocks tend south-eastward they would 
gradually pass into one undivided mass of limestone. Such a 
to be the case, and, in this state, they have often been mistaken for 
the Mountain Limestone proper. 
In the course of the excursion special attention was given to the 
demonstration of the foregoing principles by reference to facts visible 
in the field. Amongst other geological phenomena noticed was the 
origin of secondary silica, of which several excellent examples were 
met with. A demonstration upon this subject was ably given by 
Professor Percy F. Kendall. Another subject discussed in the 
presence of the facts was the evidence for the former existence of 
a rock-basin extending up the Yore from the upper falls at Aysgarth. 
It was pointed out that the river has only within recent times, 
geologically speaking, cut its way through this rock-barrier at 
Aysgarth and thus drained the above-lying lake. The subject of the 
origin of the scars and terraces of limestone was also discussed in 
the field at some length, and it was shown that their present con- 
formation can only be explained on the view that they are due to 
glacial erosion. Lastly, the origin of the glacial drifts of Wensleydale 
formed the subject of an interesting discussion. It was pointed out 
that all the drifts in this part of Wensleydale are of /vca/ origin ; that 
none of them are marine; and that the till, and the sand-and-gravel 
deposits, as well as the moraine-like deposits on the water-shed 
between the Yore and the Swale, are all of them mererly different 
forms of sediment left behind by the melting of the stony and muddy 
ice of the great ice- 
A hearty vote of rheniles to the Chaitnan: then chacinded the 
meeting.—W.F.B. 
NOTES AND NEWS. 
wil & Co., of Sheffield, where iy stipe sactcnebags and the pag abort gr 2 
i iry instinct 
ie a with its life, for its acquaintance — the industries 
i secured by one Gos of the workmen, aren. fe 
30 hie uapekeg ‘that he 
ee and w of new city ofit,and the. 
: Prevention of Cray to Animals ‘summoned him before the 
for having in his an prongaeen 
of self-preservation that it would doubtless — 2 
