xviii EIGHTH report — 1838. 



Observations for determining the Refractive Indices for the 

 Standard Rays of the Solar Spectrum in various media, by the 

 Rev. Baden Powell, M.A., F-R.S., Savilian Professor of Geome- 

 try in the University of Oxford. 



Provisional Report on the Communication between the Arte- 

 ries and Absorbents on the part of the London Committee, by 

 Dr. Hodgkin. 



Report of Experiments on Subterranean Temperature, under 

 the direction of a Committee, consisting of Professor Forbes, 

 Mr. W. S. Harris, Professor Powell, Lieut.-Colonel Sykes, and 

 Professor Phillips (Reporter). 



Inquiry into the validity of a method recently proposed by 

 George B. Jerrard, Esq., for Transforming and Resolving 

 Equations of Elevated Degrees : undertaken at the request of 

 the Association by Professor Sir W. R. Hamilton. 



Vol. VI. 



Account of the Discussions of Observations of the Tides 

 which have been obtained by means of the grant of money which 

 was placed at the disposal of the Author for that purpose at the 

 last Meeting of the Association, by J. W, Lubbock, Esq., 

 F.R.S. 



On the difference between the Composition of Cast Iron 

 produced by the Cold and the Hot Blast, by Thomas 

 Thomson, M.D., F.R.SS. L. & E.,&c., Professor of Chemistry, 

 Glasgow. 



On the Determination of the Constant of Nutation by the 

 Greenwich Observations, made as commanded by the British 

 Association, by the Rev. T. R. Robinson, D.D. 



On some Experiments on the Electricity of Metallic Veins, 

 and the Temperature of Mines, by Robert Were Fox. 



Provisional Report of the Committee of the Medical Section 

 of the British Association, appointed to investigate the Com- 

 position of Secretions, and the Organs producing them. 



Report from the Committee for inquiring into the Analysis of 

 the Glands, &c. of the Human Body, by G. O. Rees, M.D., 

 F.G.S. 



Second Report of the London Sub-Committee of the British 

 Association Medical Section, on the Motions and Sounds of 

 the Heart. 



Report from the Committee for making experiments on the 

 Growth of Plants under Glass, and without any free communi- 

 cation with the outward air, on the plan of Mr. N, I. Ward, 

 of London. 



Report of the Committee on Waves, appointed by the British 



