412 INDEX. 



having the resuhant of the attraction of the mass upon a particle in the surface, and a centri- 

 fugal force caused by revolving about one of the axes, made perpendicular to the surface, 57. 

 IvoBY (James, K.H.). On the theory of the astronomical refractions, 169. 



L. 



Light, dispersion of, researches towards establishing a theory of. No. IV., 67. 

 theory of dispersion of, as connected with polarization, remarks on, 253. 



M. 



Magnetical observations made in the West Indies, on the north coast of Brazil and North America, 



in the years 1834, 1835, 1836, and 1837, 343. 

 Magnetic force, relation of, and electric force, 274. 



intensity in the West Indies, on the north coast of Brazil and North America, 349. 



Membrana granulosa, the, 223. 



Mixed plates, on the colours of, 73. 



MosELEY (Rev. H.). On the geometrical forms of turbinated and discoid shells, 351. 



N. 



Nitrogen, an experimental inquiry into the influence of, on the growth of plants, 395 ; those seeds 

 of the same kind which contain the largest quantity germinate the earliest, 396 ; more abun- 

 dant in the roots than in the trunks of trees, 396 ; in the sap-wood than in the heart-wood, 

 397 ; in the young than in the mature leaf, 400. 



Nitrogen, on the evolution of, during the growth of plants, and the sources whence they derive 

 that element, 403. 



O. 



Operculum, traces of progressive stages of its growth remain on it, 351 ; its spiral a logarithmic 

 spiral, S5S. 



Ovisac, on the origin and structure of the true, a vesicle common to all vertebrated animals, 305 ; 

 of the Mammalia, 305; cavity in which often found, 306; proper membrane of the, in Mam- 

 malia, 306 ; peculiar granules of the, 307 ; the fluid contained in the, 308 ; the manner of 

 origin of the, 310; of Birds compared with the ovisac of Mammalia, 312; of Amphibia and 

 Fishes compared with the ovisac of Mammalia, 313; parasitic ovisacs, 318. . 



Ovum, the germinal vesicle audits contents the most primitive portion of the, 310; disappearance 

 of ova and formation of others, 319 ; the ovum conveyed to the periphery of the Graafian 

 vesicle, S'^5 ; synopsis showing the order of formation and the relative position of the several 

 parts of the unimpregnated ovum and the Graafian vesicle of Mammalia, 304. 



. the ovarian, the order of formation of the several parts of, 310. 



P. 



Powell (Rev. Baden). Researches towards establishing a theory of the dispersion of light. 

 No. IV., 67. 



_=_——— Remarks on the theory of the dispersion of light as connected with po- 

 larization, 252. 



R. 



Refractions, astronomical, on the theory of, 169; Cassini's theory, 172; problem of, Newton's 

 solutions, 178, 180; Newton's table of, 183. 



