May 8, 1879] 



NATURE 



xm 



DIARY OF SOCIETIES. 



London 



THURSDA Y, May 8. 



Royal Socikty, at 8. 30. — On the Sensitive State of Electrical Discharges 

 through Rarefied Gases : W. Spottiswoode and J. F. Moulton. — On the 

 Action of Solid Nuclei : C. Tomlinson. — On the Results of the Magnetical 

 Observatii.ns made by the Officers of the Arctic Expedition, 1875-76: Staff- 

 Commander E. W. Crealce. — On the Relation between the Diurnal Range 

 of Magnetic Declination and Horizontal Force as observed at the Royal 

 Observatory, Greenwich, during the Years 1841 to 1877, and the Period of 

 Solar Spot Frequency : W. EHis, 



Mathematical Socibty, at 8. — On the Complex whose Lines join Conju- 

 gate Points of Two Correlative Planes: Dr. Hirst, F.R.S. — Note on a 

 Geometrical Theorem connected with the Function of an Imaginary 

 Variable: Prof. Cayley, F.R.S. — Notes on some Definite Integrals: The 

 Late Prof. Clifford, F.R.S. — A Method of Constructing by Pure Analysis 



Functions X, Y, &c., which Possess the Property that rXYda = o, and 



such that any given Function can be expanded in the Form aX-\- fiY ^ 

 yZ+. . .: E. J. Routh, F.R.S.— The Numerical Cilculation of a Class 

 of Determinants and a Continued Fraction: J. D. H. Dickson. — The 

 Nephroid, Heptagon, &c. : Dr. Freeth. 



Society of Akts, at 8.— Alizarine and Allied Colouring Matters: W. H. 

 Perkin. 



Royal Institution, at 3. — Dissociation : Prof. Dewar. 



FRIDAY, May 9. 

 Royal Ikstitotion, at 9.— Habits of Ants : Sir John Lubbock. 



SATURDAY, May 10. 

 Physical Society, at 3. 



Geologists' Associatiun. — Excursion to Orpington and Knockholt. 

 Royal Institution, at 3.— Architecture: H. H. Statham. 



MONDAY, May u. 



Royal Geographical Society, at 8.30.— On the Modification of the Ex- 

 ternal A>^pects of Organic Nature produced by Man's Interference : Prof. 

 G. Rolleston. 



SociSTY of Aets, at 8.— Recent Advances in Telegraphy : W. 11. Prcecc. 

 TUESDAY, May 13. 



Anthropological Institute, at 8. — Ethnology, Mythology, and Philology 

 of Races of Early Culture, Babylonians, Etruscans, Egyptians, Japanese, 

 &c. ; Hyde Clarke. — Notes on some Irish Affinities: A. L. Lewis.— 

 History of the South- Western Barbarians. Translated from the Chinese: 

 A. Wylie. — The Spread of the Slaves, Parts 2 and 3, Sections i and 2 : 

 H. H. Howorth. 



Royal Institution, at 3. — German Literature : Prof. Hillebrand. 



West London Scientific Association, at 8. 



Horticultural Society, at i.— Scientific Committee. 



WEDNESDAY, May 14. 



Royal Microscopical Society, at 8.— On the Occurrence of Recent 

 Heteropiira : A. Wra. Waters.— New Species and Varieties of Diatomacex 

 from the Caspian Sea : A. Grunow. 



Geological Society, at 8.— tn the Pre-C.imbrian Rocks of Caernarvon- 

 shire : Prof. T. McK. Hughes.— Notes on the Structure of the Pal»jioic 

 Districts of West Somerset : A. Champemowne and W. A. E. Ussher.— The 

 Wliin SiU of Tcesdale as an Assimilator or the Surrounding Beds: C. T. 

 Clough.— On the Augitic Rocks of the Canary Islands : Salvador Calderon! 

 Communicated by the Pres.denl. 



Society of Axts, at 8.— The Automatic Hydraulic Brake : E. D. Barker. 



THURSDAY, May 15. 

 Royal Society, at 8.30. 



Royal Insti iution, at 3. — Dissociation : Prof. Dewar. 

 Society of Akts, at 8.— History of Alizarine, &c. : W. H. Perkin. 



FRIDAY, May 16. 

 Royal Ihstitutiom, at >— Etude optique de I'Elasticit^; Prof. Comu. 



SATURDAY, May 17. 

 l»YAL Institution, at 3.- Architecture : H. H. Statham, 

 'eologists' Association. — Excursion to Watford. 



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Notices of Books — Proceedings of Societies— Correspondence- 

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