Dec. 19, 1878] 



NATURE 



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NATURAL HISTORY AGENCY. 



Collections of Insects, Bird and Mammal Skins, Eggs, Shells, Skeletons 

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X.B. — Wanted Good Specimens of Xative Implements of War. 

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Can be obtained in London, through Messrs. Barclay & Sons, Farring 

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DIARY OF SOCIETIES. 



London 



THURSDAY, December 19. 



Royal Society, at 8.30. — Experiments en the Spectrum of the Electric 

 Dischar-e: the Hon. Sir W. R. Grove, F.R.S.— On the Precession of 

 Vi=c;us Spheroids, and on the Remote History of the Earth; G. H. 

 Darwin. — Problems connected with the Tides of a Viscou.s Spheroid : G. 

 H. Darwin. — On the Influence of Light upon IVotopIasm : Dr. Downes 

 and T. P. Blunt. — On the Structure and Development cf the Skull of the 

 Lacertilia; Part I., L-r. the Skull of the Common Lizard : Prof. Parker. — 

 On the Chemical Corr.pcsiticn of A!eurcne Grains : S. H. Vines. — Report 

 on Phyto-Palae?ntolog:cal Investigations generally, and on those relating 

 to the Eocene Flora of Great Britain in particular: Baron Ettingshauien. 



London iNSTmrriON, at 7. — The Abuse cf Books : Frederick Harrison. 



LiNNEAN Society, at 8.— Note en Scuth African Orchids : W. Mansell 

 SVeale. — Descriptions of Rare Shells : SyU-anus Hanley. 



Chemical Society, at 8. — Researches on the Action of the Copper-Zinc 

 Couple en Organic Compounds : Dr. Gladstone and Mr. Tribe.— On the 

 Fonnula of Glyoxylic Acid : Dr. Debus. — On the Production cf Oxides of 

 Nitrogen by the Electric Arc in Air: T. .Wills. — On Baric Periodate: 

 S. Siguira and C- F. Cross. — On Erbium and yttrium.— Dr. Humpidge 

 and Sir. Eumey. 



SUNDA Y, December 22. 



Svnday Lecture Society, at \. — Sacred Pcetrj'of the Hebrews, Hindocs, 

 &c : C. J. Plumptrc. 



MOXDAY, December 23. 



London Institdtiok, at 5. — \ Stcry-telling : W. R. S. Ralston. 

 TUESDAY, December 24. 



MSTROrOLITAN SCIENTIFIC AsSOCIATIDX, at 7. 



FRIDAY, December 27. 

 Quekett Microscopical Club, at 3. 



SATURDAY, December 28. 

 Royal Institution, at 3.— A Scap Bubble : Pr:f. Dewar. 



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LIGHTNING CONDUCTORS, 



Experience, accumulated since the time of Benjamin Franklin, prores 

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It is simple in its application, no insulators being required, and it costs 

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