GENERAL INDEX. 27 



Page 



Elasticity of water, illustrated by experiments . . . HYDROSTATICS . 1,2 



Electricity, definition and effects of . . . . PRELIMINARY TREAT. 20 



Ellipsis, descrij;tion of that curve ..... 7 



Ellipsoid, the proper form for mirrors of reflecting microscopes . OPTICS . . .22 



Endless chain of buckets for drawing water . . . . MECHANICS, t. i. . 21 



Engine for driving piles, description of .... t. ii. .51 



Equilibrium, mechanical, defined ..... t. i. . 1 



of pressure explained ..... HYDRAULICS . . 2 



its effects in modifying friction . . . MECHANICS, t. iii. 18 



Erect vision, cause of ....... OPTICS . 42 



Eriometer, an instrument for measuring minute fibres, described . . 37 



Errors in the construction of pumps pointed out . . . HYDRAULICS . .11 



Ether, elastic force of its vapour ..... HEAT . . 51 



Evaporation, cause of it explained ..... . . .58 



of fluids in air and vacuo .... ... 53 



observations on the effects of .... MECHANICS, t. i. . 31 



productive of a doubly refracting structure . . POLAR. OF LIGHT . 53 



Exhaustion of air, degree of it measured by the barometer . PNEUMATICS . 16 



Expansion of bodies by heat generally .... HYDROSTATICS 17. HEAT 6 



of air at different heats, Table of . . . HEAT . . 13 



of liquids, Table of ... 10 



of water peculiarity in ..... . . 12 



.. of solids, application of to the arts . . . . . . 8 



of bodies by heat, particular experiments on . MECHANICS, t. i. . 29 



Ej-pansive force of water on freezing ..... . 12 



Experiment, curious, with sulphate of potash and copper . . POLAR. OF LJGHT 63 



Experiments on accidental colours ..... OPTICS . . 47 



on animal strength ...... MECHANICS, t. i. . 27 



on the capacities of bodies for heat . . . HEAT . . 34 



on conductors of heat ..... . . .23 



on the expansion of liquids .... . . 11 18 



on condensed air ...... MECHANICS, t. i. . 26 



on falling bodies 1012 



.. on the cooling effects of perspiration . . . HEAT . . .55 



. . on the refraction of light .... OPTICS . . 2 



on reflected heat HEAT . . .30 



on the polarisation of light by Biot, Malus, &c. POLAR. OF LIGHT 13 



on polarised light, apparatus for, described . . 15 18 



, . on the interference of polarised light by Arago and 



Fresnel . 37 



. . on quartz by Fresnel ..... . 44 



on Vesuvian, &c. by Herschel . . . 34, 35 



Explanation of the multiplication of images in calcareous spar . 61 



of the law of the sines ..... . 2 



of the tangents .... . 10 



Extraordinary and ordinary rays of light distinguished . . . 2 



Eye, anatomical description of ..... OPTICS . . 40 



. accommodates itself to different distances . . . . . 45 



. refractive powers of its different humours . . . . . 41 



. colours produced by the unequal action of light upon , . . . 48 



insensibility of to faint light ..... . . 43 



. of birds, description of ...... PRELIMINARY TREAT. 23 



of the horse . . 24 



Eyes, causes of single vision with two ..... OPTICS . . .45 



insensibility of some, to certain colours . . . - . . 49 



Fahrenheit's thermometer compared with other thermometers HEAT . . .19 



scale compared with the centigrade ... . . 4 



Faint light, insensibility of the eye to .... OPTICS . . .43 



Fulling bodies, laws of their descent ..... MECHANICS, t. i. . 10 



Feeding pipe of pumps, error in the construction of . . HYDRAULICS . . 11 



Ferguson. James, remarks on his genius .... HYDROSTATICS . 8 



Fibres, minute, the colours and comparative measures of . OPTICS . . .37 



Films, the colours of, displayed ...... . . 33 



Fire-engines, description and representation of H YD RAUL. 15. PNEDM. 26 and MECH. t. i. 26 



Bramah's described . . . . . HYDRAULICS . . 16 



First-mover, explanation of the term .... MECHANICS, t. i. . 2 



Fishes, account of their air-bladders ..... PRELIMINARY TREAT, 24 



