288 



SCIENCE-GOSSIP. 



paper, both from the straligraphical and from the 

 palaeontological point of view. The zonal mapping of 

 the Welsh Silurians commenced by Professor Watts, 

 carried through the Rhayader Yalentian by Mr. Herbert 

 Lapworth, had here been brought out in detail stage by 

 stage through the Wenlocks of the Welsh border by the 

 author. — On an intrusion of diabase into Permo-Car- 

 boniferous rocks at Frederick Henry Bay (Tasmania), 

 by T. Stephens. The relationship of the abundant dia- 

 base to the Permo-Carboniferous strata of the island has 

 been long a matter of dispute. Among others, Jukes 

 describes sections which appeared to confirm the 

 view that Permo-Carboniferous sediments were de- 

 posited round vast masses of igneous rock previously 

 cooled and denuded. The author has identified and 

 visited the sections, and finds in one that, although 

 there is a step-like junction between the sediments 

 and the igneous rock, it is the result of the intrusion 

 of diabase, and not of the deposition of sediment. 

 The sediment, which is fossiliferous, is converted into 

 an intensely hard whitish marble, and the associated 

 shale-bands into chert. The diabase, which is ordi- 

 narily an ophitic rock, acquires at the junction a 

 finely crystalline-granular texture. Jukes's second 

 section also gives undoubted evidence of intrusion. 



NOTICES OF SOCIETIES. 



Ordinary meetings are marked f, excursions * ; names of 

 persons following excursions areof Conductors. § Lantern 

 Illustrations. 



Royal Institution of Great Britain. 

 1900. 



Feb. 9. — fSymbiosis and Symbiotic Fermentation. Professor 



J. Reynolds Green, Sc.D., F.R.S. 



„ 16.— fLife in Indo-China. H. Warington Smyth, M.A., 



LL.M., F.R.G.S. 

 „ 23. — t Recent Studies in Gravitation. Professor John H. 

 Poynting, Sc.D., F.R.S. 

 Frederick Bramwell, Hon. Sec. , A Ibemarle Street, W. 



South London Entomological and Natural History 



Society. 

 Feb. 8. — fOn the Relation of the Larval to the Imaginal 

 Legs in Lepidoptera. Dr. T. A. Chapman, 

 F.Z.S., F.E.S. 

 ,, 22.— §Another Life History. Fred. Enock, F.L.S., 

 F.E.S. 

 Stanley Edwards, Hon. Sec, Hibernia Chambers, S.E. 



North London Natural History Society. 

 Feb. 1.— tls Civilised Man Natural? Miss B. Nicholson. 

 ,, 10. — Visit to Geological Museum, Jermyn Street. J. W. 



Rudler, F.G.S., Curator. 

 „ 15.— fThe Life of a Plant. J.Wheeler. 

 Mar. 1. — t Discussion on Season in 1899. 



„ 15.— t The Primrose Family. Miss E. M. Dale. 

 ,, 24. — * Zoological Gardens, Regent's Park. 

 C. Nicholson, F.E.S., Hon. Sec, 



202 Evering Road, Clapton, N.E. 



Lambeth Field Clup and Scientific Society. 

 Feb. 5. — tThe Evolution of our Railways. T. Husson. 

 ,, 17. —Visit to Natural History Museum (Bird Gallery). 



W. Johnson. 

 ,, 19. — ^Photographic Evening — Developers. W. Rivers. 

 F. P. Perks, Hon. Sec, 41 St. Martin's Lane, W.C. 



The Sidcup Literary and Scientific Society. 

 Feb. 6,-fFrench Literature in the 18th and 19th Centuries. 

 J. J. Burrows. 

 ,, 20.— fEdison's Inventions. (',. McKenzie Mann. 

 .S\ E. Curry, Hon. Sec, Brighton Villa, Main Road, Sidcup. 



Selhorne Seen: 1 v. 



Feb. 22.— tGilbert White and Selborne. E. A. Martin. 



Edward A. Martin, F.G.S,, Hon. Sec, 



23 Campbell Road, West Croydon. 



Hampstead Astronomical and Scientific Society. 

 Feb. 2. - tThe Mechanics of the Bicycle and of Bicycle- 

 riding. C. O. Bartrum. B.Sc. 

 Basil IV. Martin, Hon. Sec, 7 Holly Place, Hampstead. 



NOTICE. 



In consequence of it having been found necessary 

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 number is a few days late in publication. 



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EXCHANGES. 



Notice. — Exchanges extending to thirty words (including 

 name and address) admitted free, but additional words must 

 be prepaid at the rate of threepence for every seven words 

 or less. 



British and Foreign shells offered in exchange for any 

 shells not in collection.— Miss F. Whitear, 5 St. Andrew's 

 Road, Enfield. 



Offered, Microscope in case. Five dozen slides in case. 

 Wanted collection of Foreign Stamps. William Gomm, Hotel 

 du Canynge, Redcliffe Street, Bristol. 



Offered. Good fresh specimen of Petricola pholadiformis 

 in exchange for other British Land Freshwater and Marine 

 Shells not in collection. Send list of duplicates. — T. Edwards, 

 Cliftonville House, Equity Koad, Leicester. 



Wanted, Book on the Microscope by Crowther.— A. 

 Nicholson, Carlton House, Greenbank Road, Darlington. 



Offered. Brazilian Butterflies, Beetles ; and other insects. 

 Correspondence invited.— A. Hempel, Caixa do Correio Z., 

 Sfio Paulo, Brazil. 



Rutherford's " Microtome " and Griffith and Henfrey's 

 " Micrographic Dictionary'' offered. Entomological and 

 Bacteria slides wanted.— J.Taylor, 83 Upper Gloucester Piac«, 

 N.W. 



2 4 FEB. 1900 



