CONTENTS 



MEMOIRS. PAOE 



Incompleteness of Combustion in Gaseous Explosions. By Prof. 

 Harold B. Dixon, F.R.S.,and H. W. Smith, B.8c 2 



A Decade of new Hymenoptera. By P. Cameron, F.E.S. Communi- 

 cated by John Boyd, Esq II 



A New System of Logical Notation. By Joseph John Murphy. 

 Communicated by the Rev. Robert Harley, M,A., F.R.S., 

 Corresponding Member ... ... .. ... ... ... ... 22 



Notes on Some of the Peculiar Properties of Glass. By William 

 Thomson, F.R.S.Ed,, F.I.C., F.C.S. 42 



On the British Species of Allolrina, with descriptions of other new 

 species of Parasitic Cynipidiz. By P. Cameron. Communicated 

 by John Boyd, Esq 53 



On the unification in the measure of time, with special reference to the 



contest on the initial meridian. By C. Tondini de Quarenghi. 



Communicated by F. J. Faraday, F.L.S 74 



Hytnenoptera Orientalis ; or Contributions to a knowledge of the 



Hymenoptera of the Oriental Zoological Region. By P. Cameron. 



Communicated by John Boyd, Esq o I 



On the equation to the Instantaneous Surface generated by the 



dissolution of an Isotropic Solid. By James Bottomley, D.Sc. 154 



On the Vitrified Cement from an ancient fort. By G. H. Bailey, 



D.Sc. Ph.D 185 



Notes on a form of Plantago viaritima [L.] new to Great Britain : 

 / Piimila (Kjellman). By James Cosmo Melvill, M.A., F.L.S. 189 



Colour and its relation to the Structure of Coloured Bodies : being an 

 investigation into the Physical Cause of Colour in natural and 

 artificial bodies and the Nature of the Structure producing it. By 

 Alexander Hodgkinson, M.B., B.Sc. With Coloured Plate. 193 



On Leaves found in the cutting for the Manchester Ship Canal, 21 feet 

 under the surface, and on Green Colouring Matter contained therein. 

 By William Thomson, F.R.S. Ed., etc. With Plate 216 



