243 



Equation for an elastic medium, 56 

 Equations, partial differential, 64 



„ numerical, 79 



Equilibrium of forces, theorem on, 235 

 Erratic blocks, transport of, 9 

 Escapements, clock, 77, 121 

 Euclid, geometry of, 127 

 Eye, affected by malformation, 27 



Fall, tendency to, 148 



Fen-land, gravel and drift of, 234 



Fluids, effect of friction on pendu- 

 lums, 104 

 ,, in motion, friction of, 16 



Force, Faraday's Lines of, 160 



Forces, composition of, 209 

 ,, equilibrium of, 235 



Formic acid, synthesis of, 235 



Fossil birds, 228 

 „ fish, 64 



Fossils, succession of, 228 



Fusion, temperature of, under pres- 

 sure, 126 



Geology of the Lake District, 187 

 Suffolk, 133 

 the Valley of Dent, 236 

 Geological discoveries in the Arctic 



Eegions, 219 

 Geometry, abstract, 232 



„ &c. new notation for, 33 



„ symbolical system of, 38 



of Euclid, 127 

 Gipping, valley of, 133 

 Glaciers, on the motion of, 2, 209 

 Gnomonic projection of sphere, 209 

 Goniometer, reflective, 117 



,, ,, substitute for, 



203 

 Gravity, variation of, 82 

 Great-circle sailing, chart for, 203 

 Greek, ancient and modern, 223 



,, accentuation of, 224 

 Green sand, Cambridge, 234 



,, ,, upper, fossil birds of, 228 

 Growth of bones, 226 



,, ,, the jaw, experiments on, 227 

 Gun cotton, 234 

 Gunpowder, effects of, 228 



Haidinger's brushes, 117, 179 



Halos, parhelia, &c. 122 



Heat, theory of, 169 



Heliotrope, new portable, 218, 239 



Human frame, on the proportions of, 



181 

 Hypotheses, transformation of, 110 



Ice-caverns, 230, 239 

 Induction, Aristotle on, 89 

 Infinite angle, values of sine and 

 cosine, 14 



Infinity, on, 229 



Instruments, surveying and astrono- 

 mical, 206 

 Integral calculus, on some points of, 



106 

 Integrals, numerical calculation of, 95 

 Integration of cliff, equations, 64 

 Internal friction of fluids, &c. 16 

 Involution of cubic curves, &c. 228 

 Isomorphous substances, 120 



Jamaica, survey of, 218 

 Jaw, growth of, 227 

 Jupiter, occultation of, 179 



Lake mountains, geological disloca- 

 tions in, 187 

 Laminated structure, production of, 53 

 Laughter, Physiology of, 224 

 Least squares, on, 5, 234 

 Light, aberration of, 19 

 ,, dispersion of, 119 

 ,, ' double refraction of, 235 

 ,, intensity of, 62 

 ,, polarization of, 27, 115, 117 

 „ reflected from crystals of pot- 

 ash, 132 

 ,, refrangibility of, 122 

 ,, transmission of, 73 

 Limestone, red, at Hunstanton, 226 

 Logic in general, 194 

 ,, of relations, 222 

 „ symbols of, 90, 121, 123 

 Longitude of Cambridge Observatory, 

 146 

 of that of St John's Col- 

 lege, 119 

 Luminous appearance, 132 

 ,, rays, theory of, 26 

 ,, vibrations, theory of, 73 



Mathematical exposition of Political 

 Economy, 99, 103 



,, * part of the " Meno," 

 217 

 Matter, theory of, 63 

 Mean values, principle of, 123 

 Mechanics and geometry, connection 



between, 15 

 Mercury, planet within its orbit, 219 

 Meteor, of Aug. 10, 1863, 227 

 Metre of an inscription in Algeria, 



218 

 Microscope, photography applied to, 



117 

 Mollusca on the coast of Norway, 168 

 Moon's motion, models illustrating, 

 173 

 , , orbit, eccentricity of, 134 

 ,, ,, method for obtaining, 



133 

 Morbid rhythmical movements, 29 



