[ vi ] 



XVI . Magnetical Observations made in the West Indies, on the North Coast of Brazil 



and North America, in the Years 1834, 1835, 1836, and 1837, hy Captain Sir 

 EvERARD Home, Bart, R.N F.R.S. Reduced hy the Rev. George Fisher, 

 M.A. F.R.S 343 



XVII. On the Geometrical Forms of Turbinated and Discoid Shells. By the Rev. 

 H. MosELEY, M.A., of Saint Johns College, Cambridge, Professor of Natural 

 Philosophy and Astronomy in Kings College. Communicated hy Thomas 

 Bell, Esq. F.R.S. 35 1 



XVIII. Contributions to the Physiology of Vision. — Part the First. On some remark- 

 able, and hitherto unobserved. Phenomena of Binocular Vision. By Charles 



Wheatstone, F.R.S., Professor of Experimental Philosophy in King's College, 

 London ^.-_^-.-.^ .-_„..^. _____ ^ ^^^ 



XIX. An Experimental Inquiry into the influence of Nitrogen on the growth of Plants. 



By Robert Rigg. Communicated by the Rev. J. B. Reade, M.A. F.R.S. 395 



XX. On the Evolution of Nitrogen during the growth of Plants, and the Sources 



from whence they derive that element. By Robert Rigg. Communicated by 

 the Rev. J. B. Reade, M.A. F.R.S. 403 



Index 409 



Appendix. 



Presents [ i ] 



Meteorological Journal hept at the Apartments of the Royal Society, by order of the 



President and Council. 



