INDEX. 



1039 



De la Rive (A. , Quelques recherches sur 

 I'arc Toltaique ; et sur rinfluence qu' 

 exerce le magnetisme, soit sur cet arc, 

 soit sur les corps qui trarismettent 

 les courants electriques discontinus, 

 659. 



, remarks on his theory for the phy- 

 sical explanation of the diurnal varia- 

 tion of the magnetic declination, 821. 



De Morgan (A.) on a point connected 

 with the dispute about the invention 

 of fluxions, 599. 



Desquamation and change of colour in a 

 negro, 623. 



Dove (H. ^Y.), maps of monthly isother- 

 mal lines, 864. 



Dew-point, observations on, compared 

 and examined, 741. 



, equal temperature of at different 



places, 946; relation of the air and 

 evaporation temperatm-es to the tem- 

 perature of, 953. 



Diamagnetics, 567, 593. 



, their action on each other insen- 

 sible ; effects of compression of, 742. 



, polar or other condition of; dif- 

 ference of magnetic and diamagnetic 

 polarity, of bismuth and other metals, 

 results referable to induced currents, 

 929 ; effects of time on currents in- 

 duced in the mass ; relation to the 

 phenomena of revulsion, 930. 



Digestion, foetal, peculiarities of, 626. 



Disease, urine affected by, 608. 



Distances, measurement of by the tele- 

 scope, 510. 



Dollond (John), bust of, 482, 520. 



Drach (A. M,), a practical exposition of 

 the apphcation of the law of mortalitv, 

 601. 



Dresser (G.) on the application of carbon 

 deposited in gas retorts as the negative 

 plate in the nitric acid voltaic batterv, 

 928. 



Dumas (J. B.), Coplev medal awarded to, 

 481. 



Dynamical stability, on, and on the oscil- 

 lations of floating bodies, 955. 



Earth, figure and primitive formation of, 

 659. 



, radiation of heat from, at night, 



664. 



, mean density of, discrepancies in, 



observation of explained, 668. 



Earthquake, slight shock of, in Channel 

 Islands, 498. 



, in Demarara, 542, 



, observations on, 993, 994. 



East (Kight Hon. Sir E. H.), obituary 

 notice of, 708. 



Echpse of the sun, 560. 



Edmonds (R.) on extraordinary oscilla- 

 tions of the sea, with an account of 

 some observations in INIount's Bay, 

 962. 



the calling of the sea, 968. 



Eggs, freezing of the albmnen of ; vital 

 power of fresh eggs, old or injm-ed 

 eggs most easily frozen, different effect 

 of the freezing point on, vitaUty of un- 

 injm'ed by mechanical causes, freezing 

 facilitated by liquefaction of the albu- 

 men, 906 ; intense cold without free- 

 zing innocuous, 907- 



Electricity, muscular, affected by chemi- 

 cal actions, 556. 



Electric current, phvsiological action of, 

 629. 



, variation of, in passage through 



nerves, 629. 



, inverse, phenomena of, relation be- 

 tween the intensitv and physiological 

 effects, 679, 



, terrestrial, connected with the di- 

 urnal variation, 683 ; postscript, 727. 



Electric telegraph, needles spontaneously 

 deflected, 682. 



Electric tension, apparatus for exalting, 

 731. 



Electric fluid, the existence of more than 



one denied, 625. 

 , the phlogiston of former chemists, 



630. 



, the coercitive agent of cohesion, 



911. 



Electricity, experimental researches in, 

 567, 592 ; influence on light, 569. 



, voltaic, means of etching by, 601. 



, negative, phenomena of repulsion, 



630. 



, tension of, may be registered, 663. 



, its action in solar radiation, 682, 



, atmospheric, its effects on telegraph 



instruments, 683. 



, disinptive discharge of ; experi- 

 ments to determine the causes of, 

 731. 



■ and nervous force, analog^^ between, 



904. 



, supposed cause of extraordinaiy 



oscillations of the sea, 962. 



, experiments to test its relation to 



gravity, 995. 



Electro-cultm'e of farm crops, 600, 



Electrodynamometer, description of, 863. 



Electrogenic, a condition of the nervous 

 svstem, exhibited in frogs, 687. 



laws of, 674, 675. 



Electro-magnet, its influence on bodies 

 transmitting discontinuous electric cur- 

 rents, 660. 



