404 
THE GEOLOr.IST. 
^ Mr. D. Page, " On llic Structure, Affinities, aud Geological Range of the 
EurypteridsE." 
Professor Harkness, " On Yellow Sandstones of Elgin and Lossiemouth." 
Rev. Dr. Longmuii-, "On the Remains of the Cretaceous Formation in 
Aberdeenshire." 
Mr. T. P. Jamieson, " On Drift-beds of the North of Scotland." 
Mr. John Cleghorii, " On the Submerged Forests of Caithness." 
Mr. Wm. Pengelly, F.G.S., "On the Ossiferous Fissures at Oreston." 
Dr. G. D. Gibb, P.G.S., "On Canadian Caverns." 
Mr. C. Moore, F.G.S., "On the supposed Wealden and other Beds near 
Elgin." 
Rev. Dr. Anderson, " On the Dura-Den sandstone." 
Mr. J. Miller, P.G.S., " On some New Fossils from the Old Red Sandstone 
of Caitlmess." 
Mr. A. Geikie, F.G.S., " On the Chronology of the Trap-Rocks of Scotland." 
Mr. H. C. Sorby, F.R.S., "On the Origin of Cone in Cone-structure." 
Rev. H. Mitchell, " On New Fossils from the Lower Old Red Sandstone of 
Scotland." 
T. F. Jamieson, Esq., " On the Junction of Granite with Stratified Rocks." 
Professor Nicol, F.G.S., " On the Geology of Aberdeenshire." 
Rev. Dr. J. Louguiuir, " On Coast-section between Aberdeen and Duunottar 
Castle." 
NOTES AND QUERIES. 
Banded Flints. — Dear Sir, — Amongst the fliuts of the Upper Chalk, I 
have met with some presenting bauds of a whitish or grey substance, alternat' 
ing in layers with the dark flint of which the nodules chiclly consist. These 
bands, or striiP, vary considerably in thickness ; in some specimens being only 
a line in breadth, in others fully a quarter of an inch. Sometimes they may be 
distinguished on the exterior of the flint.s, exhibiting the appearance of a 
projecting spiral, or a series of discs. I have never found any two specimens 
offering any great degree of similarity. I should be obliged by your express- 
ing an opinion upon tliis phenomenon in your valuable periodical. Yours 
&c., SiLEX, Luton, Bedfordshire. — Mr. N. T. Wetlierell in a paper read before 
the Geological Society of London, in Nov., 1858, referred these banded-flints, 
from which the ringed forms have been produced by weathering and the action 
of water-wear, to a peculiar concretionary action in the consolidation of the silex 
into nodules. This paper was illustrated by a very large series of bauded-flints, 
exhibiting the plienoracuon both as sections and in the screw-like or weathered 
state. Such iiints are abundant at Whetstone, Charlton, &c., and the weathered 
fragments are of very common occurrence in aU drift-gravels. 
Observations upon certain Geological Inferences. — Sir, — I should 
like to present your readers with a few remarks upon the subject of geological 
inference, inasmuch as it is one which appears to me to have been neglected, 
especi;dly as regards the primary deductions upon which the science of Geology 
has been founded. The " logic of geology," although perhaps a novel is a very 
telling phrase, and may to many appear somewhat ironical, although the term 
logic when applied to any positive science cannot but seem just : if therefore 
this phrase excites somewhat unpleasant feelings in a competent mind, especially 
wlien certain parts of the science are considered, there is a priori reason for 
believing that some gecilogical facts, or rather assumed facts, have not that 
