iv 



relations of the generating and conducting surfaces ; addressed to 

 Michael Faraday, Esq. D.C.L. F.R.S. &c. By John Frederic 

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



Researches towards establishing a Theory of the Dispersion of Light. 

 —No. IV. By the Rev. Baden Powell, M.A. F.R.S. Savilian Pro- 

 fessor of Geometry in the University of Oxford 4/' 



Experimental Researches in Electricity. — Twelfth Series. By Michael 

 Faraday, Esq. D.C.L. F.R.S. &c 47 



Proposal for a new method of determining the Longitude, by an ab- 

 solute Altitude of the Moon. By John Christian Bowring, Esq.... 52 



An Inquiry into a new Theory of Earthy Bases of Vegetable Tissues. 

 By the Rev. J. B. Reade, M.A. F.R.S 52 



Description of a new Tide-Gauge, constructed by T. G. Bunt, and 

 erected on the Eastern bank of the River Avon, in front of the Hot- 

 well House, Bristol, in 1837 53 



On the' Regar or Black Cotton Soil of India. By Capt. Newbold, 

 Aide-de-Camp to Brigadier- General Wilson 53 



Experimental Researches in Electricity. — Thirteenth Series. By Michael 

 Faraday, Esq. D.C.L. F.R.S. &c 54 



An Account of a line of Levels, carried across Northern Syria, from 

 the Mediterranean Sea to the River Euphrates. By William Taylor 

 Thomson, Esq., with Geological and Botanical Notes, by William 

 Ainsworth, Esq 57 



Supplementary Note to the Thirteenth Series of Experimental Re- 

 searches in Electricity. By Michael Faraday, Esq. D.C.L. F.R.S. 

 &c 58 



A Letter addressed to P. M. Roget, M.D. Secretary to the Royal 

 Society, by James Ivory, Esq. F.R.S., accompanying a paper on 

 Astronomical Refractions 59 



On the Theory of Astronomical Refractions. By James Ivory, Esq. 

 K.H. M.A. F.R.S. &c 60 



Remarks on the Theory of the Dispersion of Light, as connected with 

 Polarization. By the Rev. Baden Powell, M.A. F.R.S. SaviHan 

 Professor of Geometry in the University of Oxford 64 



An Experimental Inquiry into the influence of Nitrogen on the Growth 

 of Plants. By Robert Rigg, Esq 66 



Researches in Rotatory Motion. By A. Bell, Esq 66 



Researches on Suppuration. By George Gulliver, Esq., Assistant 

 Surgeon to the Royal Regiment of Horse Guards 67 



On the structure of the teeth, the vascularity of those organs, and 

 their relation to bone. By John Tomes, Esq 70 



On the evolution of Nitrogen during the growth of plants, and the 

 sources from whence they derive that element. By Robert Rigg, Esq. 70 



On the decussation of fibres at the junction of the Medulla Spinalis 

 with the Medulla Oblongata. By John Hilton, Esq 71 



Description of a self-registering Thermometer and Barometer invented 



