698 
INDEX. 
Clarke (L.). Researches on the Intimate Structure of the Brain, 263. — Appendix. On the method of 
making the preparations, 321 ; explanation of the plates, 323. 
Comet II., 1868, spectrum of, 555. 
Copper, determination of the rigidity of, 367. 
Correspondence, principle of, 145 (see Cayley). 
Crofton (M. W.). On the Theory of Local Probability, applied to Straight Lines drawn at random in 
a plane ; the methods used being also extended to the proof of certain new Theorems in the Integral 
Calculus, 181. 
Curves which satisfy given conditions, 75, 145 (see Cayley). 
D. 
Davis (J. B.). Contributions towards determining the Weight of the Brain in different Races of Man, 
505. 
Des Cloizeaux (A. L. 0.). New Researches upon the Dispersion of the Optic Axes in Harmotome 
and Wohlerite, proving these Minerals to belong to the Clinorhombic [Oblique] System, 565. 
Dispersion of the optic axes in Harmotome and Wohlerite, 565. 
E. 
Eel, caudal heart of, 675 (see Jones). 
Electricity, atmospheric, observations on, 347 (see Everett). 
Electrostatic and electrodynamic force, direct comparison of, 643 (see Maxwell). 
Equations, equal roots of, 577 (see Cayley) . 
Equations, resultant of a system of two, 173 (see Cayley). 
Evans (E. J.). On the Amount and Changes of the Polar Magnetism at certain positions in Her 
Majesty’s Iron-built and Armour-plated Ship 'Northumberland/ 487. 
Everett (J. D.). Results of Observations of Atmospheric Electricity at Kew Observatory, and at King’s 
College, Windsor, Nova Scotia, 347. 
Account of Experiments on Torsion and Flexure for the Determination of Rigidi- 
ties. — Third Paper, 363. 
F. 
Fermat’s mysteries of numbers, 627 (see Pollock). 
G. 
Gamgee (A.). Researches on the Blood. — On the Action of Nitrites on Blood, 589, 
H. 
Harmotome, correction of the crystalline form of, by optical phenomena, 565. 
Huggins (W.). Further Observations on the Spectra of some of the Stars and Nebulae, with an Attempt 
to determine therefrom whether these Bodies are moving towards or from the Earth, also Observa- 
tions on the Spectra of the Sun and of Comet II., 1868, 529. 
