410 INDEX. 



Conductors and insulators, analogy of, 86. 



Convection, or carrying discharge, 142. 



Current, nature of electric, 156; constant character of, 158. 



D. 



Daniell (J. F. Esq.). Fourth letter to Michael Faraday, Esq., on voltaic combinations, with 



reference to the mutual relations of the generating and conducting surfaces, 41 . 

 Davy (John, M.D.). An account of some experiments on the blood in connexion with the theory 



of respiration, 283. 

 Dip of magnetic needle, in the West Indies, on the north coast of Brazil and North America, 



345, 349. 

 Disc, the, of Professor Baer, 320. 

 Discharge {e\ectY\c), conductive, 84; disruptive, 95, 125; electrolytic, 90 ; difference of, at the 



positive and negative surfaces of conductors, 120, 125; spark, 105; brush, 110; glow, 134; 



dark, 138 ; convective, 142. 



E. 



Electric charge, penetration of within a dielectric, 23. 



current, nature of, 156; transverse force of, 165. 



force or forces, nature of, 265; relation of the electric and magnetic forces, 274. 



Electrical excitation, note on, 280. 



Electricity, experimental researches in. Eleventh series, 1. § 18. On induction, i. Induction 

 an action of contiguous particles, 1. ii. Absolute charge of matter, 4. iii. Electrometer and 

 inductive apparatus used, 6. iv. Induction in curved lines, 16. v. Specific inductive ca- 

 pacity, 25. vi. General results as to induction, 37. Supplementary note, 79. 



. Twelfth series, 83. § 18. On Induction (continued). 



vii. Conduction, or conductive discharge, 84. viii. Electrolytic discharge, 90. ix. Disrup- 

 tive discharge and insulation, 95. Spark, 105. Brush, 1 10. Difference of discharge at 

 the positive and negative surfaces of conductors, 120. 



Thirteenth series, 125. § 18. On Induction (continued). 



ix. Disruptive discharge (continued). — x. Peculiarities of positive and negative discharge 

 either as spark or brush, 125. Glow discharge, 134. Dark discharge, 138. Convection or 

 carrying discharge, 142. Relation of a vacuum to electrical phenomena, 154. § 19. Nature 

 of the electrical current, 1 56. 

 . Fourteenth series, 265. § 20. Nature of the electric 



force or forces, 265. § 21. Relation of the electric and magnetic forces, 274. § 22. Note 

 on electrical excitation, 280. 



Electrolytic action, 156; discharge, 90. 



Ellipsoids of equilibrium, consisting of homogeneous matter, 57. 



Embryology, researches in. First series, 301. Part I. On the origin and structure of the true 

 ovisac, a vesicle common to all vertebrated animals, 305 ; on the germinal vesicle and its con- 

 tents, as the most primitive portion of the ovum, 308 ; on the order of formation of the several 

 other parts of the ovarian ovum, 310; and on the true chorion of Mammalia as a structure 

 superadded within the ovary, 316. Part II. On a granulous tunic of the ovum of Mam- 

 malia not hitherto described, 320 j on the manner of origin of the " Membrana granulosa" of 



