404 



THE GEOLOGIST. 



Mr. D. Page, "On the Structure, Affinities, and Geological Range of the 

 Eurypteridse." 



Professor Harkness, " On Yellow Sandstones of Elgin and Lossiemouth." 

 Rev. Dr. Longmuir, " On the Remains of the Cretaceous Eormation in 

 A-bGrcLcciisliirG 



Mr. T. E. Jamieson, " On Drift-beds of the North of Scotland." 

 Mr. John Cleghorn, "On the Submerged Forests of Caithness." 

 Mr. Wm. Pengelly, E.G.S., "On the Ossiferous Fissures at Oreston." 

 Dr. G. D. Gibb, F.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, F.G.S., " On some New Fossils from the Old Red Sandstone 

 of Caithness." 



Mr. A. Geikie, E.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. Longmuii-, " On Coast-section between Aberdeen and Dumiottar 

 Castle." 



NOTES AND QUERIES. 



Banded Flints. — Dear Sir, — Amongst the flints of the Upper Chalk, I 

 have met with some presenting bands of a whitish or grey substance, alternat- 

 ing in layers with the dark flint of Avhich the nodules chiefly consist. These 

 bands, or strise, 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 flints, 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. Wetherell 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. Tliis paper was illustrated by a very large series of banded-flints, 

 exhibiting the phenomenon both as sections and iu tKe screw-Eke or weathered 

 state. Such flints are abundant at Whetstone, Charlton, &c., and the weathered 

 fragments are of very common occurrence in all 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, 

 especially 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 

 lo^ic when applied to any positive science camiot but seem just : if therefore 

 tins ]-)hrase excites somewhat unpleasant feelings in a competent mind, especially 

 when p(Miain parts of the science are considered, there is a priori reason for 

 b(>licving lliat some geological facts, or rather assumed facts, have not that 



