1040 



INDEX. 



Electro-magnet, its action on the voltaic 

 arc, 660. 



Electro-physiological researches, 555. 



. — , 5, 6, 7 and 8th series, 678. 



, 7th series, 902 : nervous tila- 



ments not capable of acting as elec- 

 troids, 902 ; electric current acts on the 

 nervous force of currents in muscular 

 fibre ; different conductibility of nerve 

 and muscle ; strongest contractions in 

 the muscles of animals longest killed, 

 903 ; caused by repose of the muscle, 

 speedy exhaustion under stimulants the 

 only consequence of separation from 

 nervous centres ; analogy between elec- 

 tricity and nervous force, contraction 

 produced by direct current ; pain pro- 

 duced by inverse cuiTent, nervous force 

 circumferential or central according to 

 direction of electric current, 604. 



. , the cause of contraction an 



electrical phenomenon developed in 

 the act of contraction ; demonstration 

 and disequilibrium, 966. 



Electrostatics, Franklin's theory of, ex- 

 plained, 630. 



Electrotelegraphic determination of lon- 

 gitude, 1005. 



Ehiot, (Capt. C. M.), letter to Lieut.-Col. 

 Sabine, on the magnetic survey of the 

 Indian Archipelago, 908. 



Elliptic functions, theory of, apphed to 

 the rotation of a rigid body round a 

 fixed point, 797. 



Endosmose, in plants, unatFected by heat 

 or light, 685. 



, relation of, to difFusibihties, 900. 



England, meteorologv of, during the years 

 1847, 1848 and 1849, 945 ; equal tem- 

 perature of tbe dew-point, and equal 

 amount of water in the atmosphere, 

 at difi'erent places, 946. 



Entozoon folliculorum, researches into 

 the structure of, 485. 



Epidermis, grovrth and development of, 

 563, 



Equations, numerical, resolution of, 515. 



, Mr. Boole's method of solution of, 



522. 



, limits of tbe roots of, new method 



of finding, 630. 



, hnear differential, solution of, 687. 



■ , linear differential, equation of, 802. 



, infinite differences and linear diffe- 

 rential, general methods in analysis for 

 the resolution of, 814. 



, numerical, analysis of, 854. 



— — , linear differential, on the solution 

 of, 937. 



Erythrelesic acid, 736. 



Erythric acid, 736. 



Ether, orseUesic, and erythric methylic, 

 736. 



Ethylamine and its compounds, 905. 

 Evernia prunastri, 737. 

 Evemic acid, 737. 



Fairbairn, (W.), an experimental inquiry 

 into the strength of MTOught iron plates 

 and riveted joints as appUed to ship- 

 building, 960. 



Faraday (M,), analysis of sea- water, 476. 



on the liquefaction and sohdifica- 



tion of bodies generally existing as 

 gases, 540 ; additional remarks, 547. 



, experimental researches in electri- 

 city, 19th series ; on the magnetization 

 of light, and the illumination of mag- 

 netic lines of force, 567. 



• , 20th series, on new magnetic ac- 

 tions, and on the magnetic condition 

 of all matter, 592. 



, Rumford medal awarded to, 635. 



, royal medal awai'ded to, 635. 



, 22nd series, on the crystalline po- 

 larity of bismuth and other bodies, 

 and on its relation to the magnetic 

 form of force, 780. 



, 23rd series, on the polar or other 



condition of diamagnetic bodies, 929. 



, 24th series, on the possible relation 



of gravity to electricity, 994. 



, 25th series, on the magnetic and 



diamagnetic condition of bodies, 995. 



— — , 26th series, on magnetic conduct- 

 ing power and atmospheric magnet- 

 ism, 998. 



Fermat's theorem of polygonal numbers, 

 extension of the principle of, 922. 



Fielding (G. H.), observations on the 

 heights of the thermometer and baro- 

 meter made at Lenham Lodge, in June 

 1846,625. 



Fish, poisonous, effects of, 609. 



, ganoid and placoid, microscopic 



structure of the scales and dennal 

 teeth of, 837 ; the enamel a compound 

 structure composed of ganoin and kos- 

 mine ; instances in which the ganoid 

 and placoid merge into each other ; 

 ganoid scales consist of osseous lamellae, 

 dermal appendages useful in determi- 

 ning allied species and afiinities, 838. 



Fishes, structure and development of the 

 scales and bones of, 969 ; scales com- 

 posed of two calcareous and one mem- 

 branous laminae, 970; cartilaginous 

 origin of the bones ; resemblance of the 

 processes of calcification ; near affini- 

 ties of bone, dentine, ganoin, &c., 971. 



Fitzgerald and Vesey (Lord), obituary 

 notice of, 485. 



