iv CONTENTS. 



Page; 

 Lebotik, Mr. A. B. Wynne, Mr. Gailoway, Mr. Joseph Dickinson, Mr. 

 G. F. Deacon, and Mr. E. Wetheked, appointed for the purpose of in- 

 vestigating tha Kate of Increase of Underground Temperatui-e downwai-ds 

 in various Localities of Dry Land and under Water. Drawn up by Pro- 

 fessor Evebett (Secretary) 2& 



Eeport of the Committee, consisting of Dr. 0. J. Lodge (Secretary), Professor 

 W. E, Akyton, and Professor J. Perry, appointed for the purpose of de- 

 vising and constructing an improved form of High Insulation Key for 

 Electrometer Work 29 



Report of the Committee, consisting of Professor Cayiey, F.R.S., Professor- 

 G. G. Stokes, F.RS., Professor H. J. S. Smith, F.R.S., Professor Sir 

 WrLiiAM Thomson, F.R.S., Mr. James Glaisher, F.R.S., and Mr. J. W. 

 L. Glaisher, F.R.S. (Secretarj^), on Mathematical Tables. Drawn up by 

 Mr. J. W. L. Glaisher Sa 



Report of the Committee, consisting of Professor Sylvester (Chairman), 

 Professor Cayley, and Professor Salmon, appointed for the purpose of 

 calculating Tables of the Fundamental Invariants of Algebraic Forms 38. 



Report of Observations of Luminous Meteors during the year 1879-80, by a 

 Committee consisting of Jamais Glaisher, F.R.S., &c., E. J. Lowe, F.R.S.,. 

 &c., Professor R. S. Ball, F.R.S., &c., Professor G. Forbes, F.R.S.E., 

 Walter Flight, D.Sc, F.G.S., and Professor A. S. Hersohel, M.A., 

 F.R.A.S 39 



First and Second Reports of the Committee, consisting of Mr. David Gill, 

 Professor G. Forbes, Mr. Howard Grubb, and Mr. C. H. Gimingham, 

 appointed to consider the question of Improvements in Astronomical Clocks 5S 



Report of the Committee, consisting of Professor Sii" William Thomson, 

 Professor Tait, Dr. C. W. Siemens, Mr. F. J. Bkamwell, and Mi-. J. T. 

 Bottomley (Secretary), for commencing Secular E.^periments on the 

 Elasticity of Wires 61 



Sixteenth and concluding Report of the Committee, consisting of John Evans, 

 F.R.S., Sir John Lubbock, Bart., F.R.S., Edward Vivian, M.A., George 

 Bitsk, F.R.S., William Boyd Dawkins, F.R.S., William Ayshfobd. 

 Sanfoed, F.G.S., John Edward Lee, F.G.S., and AVilliam Pengelly, 

 F.R.S. (Reporter), appointed for the purpose of exploring Kent's Cavern, 

 Devonshire 62 



Report on the mode of reproduction of certain species of Ichthyosaurus from 

 the Lias of England and Wiirtemberg, by a Committee consisting of Pro- 

 fessor H. G. Seeley, F.R.S., Professor W. Boyd Dawkins, F.R.S., and Mr. 

 C. Moobe, F.G.S. Drawn up by Professor H. G. Seeley 68 



Report of the Committee, consisting of Professor P. M. Duncan and Mr. G. R. 

 Vine, appointed for the purpose of reporting on the Carboniferous Polyzoa. 

 Drawn up by Mr. Vine (Secretary) 76 



Report of the Committee, consisting of Dr. J. Evans, Professor T. G. Bonney, 

 Mr. W. Careuthers, Mr. F. Drew, Mr. R. Etheridge, Jim., Professor G. 

 A. Lebouk, Professor L. C. Miall, Professor H. A. Nicholson, Mr. F. W. 

 Rttdlee, Mr. E. B. Tawney, Mi-. W. Topley, and Mr. W. Whitakek 

 (Secretary), for carrying on the 'Geological Record.' 87" 



Sixth Report of the Committee, consisting of Professor Hull, the Rev. H. W. 

 Crosskey, Captain D. Galton, Mr. Glaisher, Professor G. A. Leboue, Mr. 

 W. MoLYNEUx, Mr. Morton, Mr. Pengelly, Professor Peestwich, Mr. 

 Plant, Mr. Mellard Reade, Mr. Roberts, Mr. W. Whitakee, and Mr. 

 De Bawce (Reporter), appointed for investigating the Circulation of the 



