\y CONTENTS. 



rage 



A Memoir on the Magnetic Isoclinal and Isodynamic Lines in the 

 British Islands, from Observations by Professors Humphrey 

 Lloyd and John Phillips, Robert Were Fox, Esq., Captain 

 James Clark Ross, R.N., and Major Edward Sabine, R.A. By 

 Major Edwakd Sabine, R.A., F.R.S 49 



First Report on the Determination of the Mean Numerical Values 

 of Raihvay Constants. ByDioNYSiusLARDNER,LL.D.F.R.S.,&c. 197 



First Report upon Experiments, instituted at the request of the 

 British Association, upon the Action of Sea and River Water, 

 ■whether clear or foul, and at various temperatures, upon Cast 

 and Wrought Iron. ByRoBERTMALLET,M.R.l.A. Ass.Ins.C.E. 253 



Notice of Experiments in Progress, at the desire of the British 

 Association, on the Action of a Heat of 212° Fahr., when long 

 continued, on Inorganic and Organic Substances, By Robert 

 Mallet, M.R.I.A.. 313 



Provisional Reports and Notices of Progress in Special Re- 

 searches entrusted to Committees and Individuals 31.5 



Report of the Committee for the Liverpool Observatory 316 



Notice of Apparatus for the Detection and Measurement of Gases 

 present in minute quantity in Atmospheric Air. By Wm. West. 316 



Notices of Progress in Special Researches 317 



Appendix to a Report on the Variations of the Magnetic Intensity 

 (printed in Vol. VI.). By Major Edward Sabine, F.R.S. , 

 &c 318 



For Contents of the Notices and Abstracts of Communications to the 

 British Association for the Advancement of Science, at the New- 

 castle Meeting, August, 1838, see pp. iii — viii. of the second portion 

 of this Volume. 



Indices I. and II 179, 180 



For Catalogue of the Philosophical Instruments, Models of Inventions, 

 Products of National Industry, &c., &c., contained in the First Ex- 

 hibition of the British Association for the Advancement of Science, 

 see the end of this volume. 



Plates I.— XVII. 



