134 Reports and Proceedinga — Geological Sociefg of London. 



Darttiiouth slates are horaotaxially correlated with the Foreland grits, 

 the discovery of Pteraspis materially strengthens this correlation, as 

 Mr. IJssher has shown, that these remains are not restricted to the 

 Dartmouth slates proper, but range up into dark slates presumably 

 belonging to the Meadfoot group". Our attention was called some 

 time ago by Mr. Upfield Grreen to the title of a paper read before the 

 Geological Society on Ifovember 23, 1870, "On the Discovery of 

 a 'Bone Bed' in the lowest of the ' Lynton Grey Beds', I^orth 

 Devon," by F. Eoyston Fairbank, M,D. The title only was printed 

 in the Quarterly Journal (1871, vol. xxvii, p. 38), the paper having 

 been withdrawn. The abstract, however, with the discussion, 

 appeared in the Geological Magazine for January, 1871, p. 88. 

 Mr. R. H. Valpy then stated that he had recognized similar beds 

 along the coast of North Devon, an account of which had already been 

 published at Ilfracombe. (See his Notes on the Geology of llfracomhe, 

 printed by Twiss & Sons, Ilfracombe, no date.) — H. B. W. 



I. — Geological Societt of London. 



I.— January 13, 1909.— Professor W. J. Sollas, LL.D., Se.D., F.R.S., 



President, in the Chair. 



The President announced that the Council, at its meeting that 

 afternoon, had passed the following resolution: — 



' ' The Council of the Geological Society desires to express to the relatives of 

 Professor H. G. Seeley, F.E.S., its profound sorrow in the death of one who had 

 heen a Fellow for nearly half a century, had frequently served on the Council of the 

 Society, and for so many years continued to enrich the literatui'e of Geology and 

 Palaeontology by numerous original researches in these Sciences." 



The following communications were read: — 



1. "On Labradorite-Norite with Porphyritic Labradorite." By 

 Professor Johan H. L. Vogt, F.M.G.S. 



This paper deals with a rock occurring at Napp Farm, on Flakstado, 

 off the northern coast of Norway. It contains 23 per cent, of labra- 

 dorite-phenocrysts, in a crystalline groundmass made up of a more 

 acid plagioclase, hypersthene, diallage, and titano-magnetite, with 

 small quantities of biotite, and very little spinel, apatite, and pyrite. 

 A little secondary hornblende and some garnet are present, but few 

 other secondary products. Olivine is conspicuously absent. 



The plagioclase-phenocrysts are more acid in their outer zones, and 

 the groundmass plagioclase is still more acid as determined optically 

 and by specific gravity and analysis. Analyses are tabulated of the 

 bulk of the rock and the groundmass and of the separated plagioclases 

 and the magnetite. From these the relative proportions of the 

 constituents are calculated and the formula of the felspars determined ; 

 also the titano-magnetite proves to be a mixture of magnetite with 

 ilmenite. 



The order of crystallization is found to be : (1) Phenocryst 

 plagioclase; (2) plagioclase with magnetite; and (3) plagioclase, 

 magnetite, pyroxenes. The plagioclase-plienocrysts started to form at 



