DESIDERATA, ETC. XV 
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. 
Vou. 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.S., 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 
oF Glands, &c., of the Human Body, by G. O. Rees, M.D. 
.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- 
_ eation with the outward air, on the plan of Mr. N. I. Ward, 
_ of London. 
Report of the Committee on Waves, appointed by the British 
Association at Bristol in 1856, and consisting of Sir John Robi- 
