606 
INDEX. 
D. 
De La Rue (W.), Stewart (B.), and Loewy (B.). Researches on Solar Physics. — No. IT. The 
Positions and Areas of the Spots observed at Kew during the years 1864, 1865, 1866, also the Spotted 
Area of the Suu’s visible disk from the commencement of 1832 up to May 1868, 389; postscript, 
396 ; tables, 399. 
Diprotodon australis, 519. 
Dufour, Professor, description of a case of hemiopsia, 250. 
E. 
Earth-currents, comparison of, with magnetic disturbances, 215 (see Airy, G. B.). 
Enstatite in Busti meteorite, 204, 208. 
Errors of observation, 175 (see Crofton). 
F. 
Ferrers (N. M). Note on Professor Sylvester’s representation of the Motion of a free rigid Body 
by that of a material Ellipsoid whose centre is fixed, and which rolls on a rough Plane, 1. 
Fluoride of silver, 227. 
Fossil remains, 65, 79, 519 (see Owen). 
France, magnetic survey of the west of, 33. 
G. 
Geometry of m-dimensions, 51 (see Cayley). 
Gladstone (J. PI.). On the Refraction-Equivalents of the Elements, 9. 
Glaisher (J. W. L.). Tables of the Numerical Values of the Sine-integral, Cosine-integral, and Expo- 
nential-integral, 367. 
Gore (G.). On Fluoride of Silver, 227. 
H. 
Hemiopsia, on a distinct form of, 247 ; descriptions of, by Wollaston, 248; by Brewster, 249; by 
G. B. Airy, 250; by Dufour, 250 ; by J. F. W. Herschel, 251 ; by Wheatstone, 253; by 
H. Airy, 255. 
I. 
Idiots, skulls of, 166. 
Integrals, tables of the numerical values of certain, 367 (see Glaisher). 
J. 
Jevons (W. S.). On the Mechanical Performance of Logical Inference, 497. 
L. 
Lama, description of an extinct, 65 (see Owen). 
Laplace’s coefficients, theorem relating to, 579 (see Strutt). 
Least squares, 175 (see Crofton). 
Loewy (B.) (see De La Rue). 
Logical inference, mechanical performance of, 497. 
