INDEX. 



1045 



Light, epipolic dispersion of; character 

 of, 549. 



— — , elliptic polarization of, 55 7. 



, magnetization of, 567. 



, various effects of, in photogenic 



operations, 681. 

 , its influence on aquatic plants, 685 ; 



on leaves, 686. 

 , polarized influence of magnetism 



on, 741. 



■ rays, rotation of; passed through 

 quartz and heavy glass ; greater in one 

 direction than the other, 741. 



, new case of the interference of; 



caused by oil of sassafras, anise, 

 cassia ; production of dai'k hands ; for- 

 mula for, 756; effects of doubly re- 

 fracting media; indices determinable, 

 757. 



, zodiacal, instrument for measuring, 

 761. 



-— — experiments and observations on 

 the properties of, 900 ; the flexion of 

 pencils or beams proportionate to the 

 breadth of coloured fi-inges ; fringes, 

 more than three and very nume- 

 rous ; deflexion and inflexion more 

 or less easy after the first flexion ; in- 

 flexion and deflexion of bodies, results 

 of ; alternative disposition communi- 

 cated by flexion, strongest nearest the 

 first bending body; vadatious of the 

 fringes, 901; deflexion fringes de- 

 crease, inflexion fringes increase with 

 distance from direct rays ; increase 

 caused by the joint action of two 

 bodies, 902. 



Lightning, proximate cause of, 731. 



LiUe, St. Leonai'd de, de I'education des 

 animaux, 511. 



Liquid, colourless, superficial colour pre- 

 sented by, 547. 



Liquids, on the diffusion of, 897 ; the 

 diffusion cell ; difFusibility of various 

 substances ; generally equal in iso- 

 morphous compounds ; low diffusi- 

 bility of albumen, 898 ; independent 

 diffusion of mixed salts ; production 

 of chemical decompositions ; mutual 

 diffusibility of salts ; numerical rela- 

 tions of diffusibilities, 899; bearing on 

 the study of endosmose, 900. 



, supplementary observations on ; 



similar diffusibility of isomorphous 

 salts, 980 ; hydrogen, nitric, sulphu- 

 ric, chlorine, acetic, and sulphurous 

 acids, &c. ; times of diffusion of, 982, 

 989. 



Liver, secretory apparatus and function 

 of, 600. 



, structure and development of, 693 ; 



in polypi and in insects ; parenchyma- 

 tous portion of, 693 ; in reptiles, Isirds 

 and mammalia, 694. 



London, relative temperature of, high in 

 winter, low in summer, due to the vi- 

 cinity of the Thames, 927. 



Longitude, determination of difference 

 of by magnetic telegraph ; clocks 200 

 miles apart compared, 787 ; elimination 

 of errors, 788. 



Loomis (E.) on the determination of the 

 difference of longitude, by means of 

 the magnetic telegraph, 787. 



Lowe (E.), observations on two hundred 

 and eighty-seven thunderstorms made 

 at Highfield house, near Nottingham, 

 during the last nine years, 957. 



Ludlow (J. 0. E.), an account of the ob- 

 servation of the total eclipse of the sun 

 on Dec. 21, 1843, 560. 



Macaire (Prof.) on the direction assumed 

 by plants during their growth, 684. 



Maccullagh (J.), obituary notice of, 712. 



Mace, the, belonging to the Royal Society, 

 history of, 612. 



Macintosh (Charles), obituary notice of, 

 486. 



Magnetical experiments on board H.M. 

 iron steam-vessel. Bloodhound, 727. 



Magnetic and diamagnetic condition of 

 bodies, 995 ; experiments on gases, 

 995-6 ; motions of magnetics and dia- 

 magnetics differential, 996 ; action of 

 gases in torsion balance ; superior ef- 

 fects of oxygen, 997 ; conducting 

 power ; dependent on position of mag- 

 necrystallic axis, 998, 



Magnetic declination, observations on, in 

 Southern Pacific, 507. 



, diurnal variation of, at St. 



Helena, 664. 



, remarks on De la Rive's theoi7 



for the physical explanation of the causes 

 of the diurnal variation of, 82] ; not 

 uniform at St. Helena throughout the 

 year, 822 ; contrary in two six-monthly 

 periods ; similar results at the Cape of 

 Good Hope, 823 ; probable causes, 824. 



Magnetic force, axial and equatorial, 

 593. 



, relation to, of bismuth and 



other bodies, 780. 



, phenomena and motions of 



metals under the, 855. 



■ ■ , means adopted for determining 



the absolute values, secular change, and 

 annual variation of ; secular change 

 indicated by monthly results, 942 ; 

 annual decrease of ; annual vaiiation of 

 horizontal force, 943 ; earth's position 



