CONTENTS. 



MEMOIRS. PAGE 



On the possible equations expressing the decomposition of Potassic 



Chlorate by Heat. By James Bottomley, D.Sc, B.A., F.C.S. ... 4 



Pasteur and Faraday : Note on Dr. Tyndall's Introduction to the English 

 Edition of the " Histoire d'un Savant par un Ignorant." By F. J. 

 Faraday, F.L.S 7 



On the Electrical Attraction of Quartz, &c. By Alex. Hodgkixson, 



M.B., B.Sc 15 



The effect of the small variation of the density of the atmosphere on the 

 ampHtude of plane waves of Sound approaching the earth. By 

 Ralph Holmes, B.A 18 



Memoir of the late Joseph Baxendell, F.R.S., F.R.A.S. By James 

 Bottomley, D.Sc. 



An application of Huyghens' Principle to a spherical wave of light. By 

 R. F. Gwyther, M.A 



28 



61 



Notes on a Small Collection of Mosses from Mauritius. By J. CosMO 



Melvill, M.A., F.L.S ••• 100 



On the change of incidence of Small-Pox at different ages during the years 



1848-86. Parti. By R. F. Gwyther, M.A 105 



A method of calculating the Electrostatic Capacity of a Conductor. By 

 Henry Holden, B.Sc, Bishop Berkeley Fellow in Physics at the 

 Owens College, Manchester. Communicated by Professor Schuster, 

 F.R.S "2 



On the change of incidence of Small-Pox at different ages. Part 11. By 



R. F. Gwyther, M.A 121 



Descriptions of twenty-three new species of Hymenoptera. By P. 



Cameron. Communicated by Charles Bailey, F.L.S i59 



A survey of the genus Cypnva (Linn.), its Nomenclature, Geographical 

 Distribution, and Distinctive Affinities : with descriptions of two new 

 species and several varieties. Plates I. and II. By James Cosmo 

 Melvill, M.A., F.L.S 1S4 



