xix 



construction of the Solar and Oxy-hydrogen Gas Microscopes. By 



the Rev. J. B. Reade .page 457 



1837. 



An attempt to account for the discrepancy between the actual Velo- 

 city of Sound in Air or Vapour, and that resulting from Theory. 

 Bv the Rev. William Ritchie, LL.D. F.R.S. Professor of Natural 

 Philosophy at the Royal Institution, and in University College, 

 London ... . 458 



Researches towards establishing a Theory of the Dispersion of Light. 

 By the Rev. Baden Powell, M.A. F.R.S. Savilian Professor of 

 Geometry in the University of Oxford 459 



A few remarks on the Helm Wind. By the Rev. William Walton, of 

 Allenheads, near Hexham 459 



A Meteorological Journal kept at Allenheads, 1400 feet above the 

 level of the Sea, from the 1st of May to the 1st of November, 

 1 836. By the Rev. William Walton 460 



On the Structure of the Brain in Marsupial Animals. By Richard 

 Owen, Esq. F.R.S. Hunterian Professor of Anatomy to the Royal 

 College of Surgeons 460 



Observations on the Electro-chemical Influence of long-continued Elec- 

 tric Currents of Low Tension. By G. Golding Bird, Esq. F.L.S. 

 F.G.S. Lecturer on Experimental Philosophy at Guy's Hospital ... 461 



On the Elementary Structure of Muscular Fibre of Animal and Or- 

 ganic Life. By Frederic Skey, Esq. Assistant Surgeon, to St. 

 Bartholomew's Hospital 462 



On the Function of the Medulla Oblongata and Medulla Spinalis, and 

 on the Excito-motory System of Nerves. By Marshall Hall, M.D. 

 F.R.S. L. & E. &c 463 



Researches on the Tides. Seventh Series. On the Diurnal Inequality 

 of the Height of the Tide, especially at Plymouth and at Sincapore : 

 and on the Mean Level of the Sea. By the Rev. W. Whewell, A.M. 

 F.R.S. Fellow of Trinity College, Cambridge 465 



On the Tides. By J. W. Lubbock, Esq. M.A. F.R.S 466 



Further Observations on Voltaic Combinations. By John Frederick 

 Daniell, Esq. F.R.S. Professor of Chemistry in King's College, 

 London 469 



Observations taken on the Western Coast of North America. By the 

 late Mr. Douglas : with a report on his paper ; by Major Edward 

 Sabine, R.A. F.R.S. .. r .... 471 



Analysis of the Roots of Equations. By the Rev. R. Murphy, M.A. 472 



On the first Changes in the Ova of the Mammifera, in consequence of 

 Impregnation; and of the mode of origin of the Chorion. By Thomas 

 Wharton Jones, Esq. . 473 



On the adaptation of different modes of illuminating Light-houses, as 

 depending on their situations and the object contemplated in their 

 erection. By William Henry Barlow, Esq. 474 



On the connexion between the Phenomena of the absorption of Light 

 and the Colours of thin Plates. By Sir David Brewster, K.H. F.R.S. 475 



