GENERAL INDEX. 



The references are given to the treatise, or treatises in which the article is to be found. Of the con. 

 tractions, PR EL. TREAT, stands for Preliminary Treatise; HYDROST. for Hydrostatics ; HYDRAUL. 

 for Hydraulics i P.vEUM.for Pneumatics; MECH. t. i., MECU. t. ii., MECH. t. iii., for the first, second, 

 und third treatises on Mechanics, respectively; and POLAR. OF LIGHT, for the treatises on the 

 Polarisation of Light. 



Aberration of light, spherical, in lenses .... OPTICS . 



in mirrors .... 



Absolute heat in bodies of different temperatures . . HEAT . . 



Absorbing crystals with one axis, list of .... POLAR. OF LIGHT 



with two axes . . . . . 



Absorption and reflection of heat ..... HEAT 



of light in doubly refracting crystals . . POLAR. OF LIGHT 



influence of heat in modifying . . 



Acceleration of motion in falling bodies . . . MECHANICS, t. i. 



Accidental colours, or ocular spectra .... OPTICS . 



experiments on . . , . 



Achromatic telescopes, principles and description of . . . . 



Action of crystallized bodies upon polarised light in producing 



colours ......... POLAR. OF LIGHT 



Active and passive forces explained and distinguished . . MECHANICS, t. iii. 



Aerostats, or air-balloons, principles of .... PNEUMATICS 



Air, description and properties of 



condensed, experiments on . . 

 elasticity of . 



atmospheric, its capacity for caloric 

 pressure of ... 



table of its expansion by heat 

 a mechanical agent 

 weight of ... 



A r-balloons, principle of . 



bladder of fishes, use of 

 gun, description of 

 thermometer, description of . 

 pump ..... 



vessel of birds described 



. . in machinery . . 



Alcohol, distillation of, described . 

 elastic force of its vapour 

 Algebra, or universal arithmetic, defined 

 Amethyst, circular polarisation in 



structure of the perfectly formed . . . . 



Analcime, new species of double refraction in ... . 



Anatomy, separate and comparative, its uses . . . PRELIMINARY TREAT. 



Animal electricity, or galvanism, explained .... . . 



strength, experiments on .... 

 Angle of draught, having the least friction . . 



of polarisation of different substances, table of the 



MECHANICS, t. i. 



PNEUMATICS 

 . HEAT . 

 PREL. TREAT. 19,26. 

 . HEAT 



MECHANICS,!, i. 



Page 

 20 

 22 

 39 

 46 

 48 

 33 

 46 

 48 

 9 



46 

 47 

 27 



1820 

 1 



. 28 

 2 



. 26 

 . 11, 14 

 . 38 

 PNEUM. 13 

 13 

 23 



HYDROST. 1. PNEUM. 4 



PNEUMATICS . 28 



PRELIMINARY TREAT. 24 

 PNEUM. 28. MECH. t. i. 26 



HEAT ... 15 



PNEUMATICS . 14 



PRELIMINARY TREAT. 24 



HYDRAUL. 13. PNEUM. 25 



HEAT . 



PRELIMINARY TREAT. 

 POLAR. OF LIGHT 



MECHANICS, t. i. , 



. t. in. ID 26' 



POLAR. OF LIGHT. . 9 

 Ants, description of the economy of ..... PRELIMINARY TREAT. 28 



Apophyllite, extraordinary system of its coloured rays 



tesselated, its remarkable formation . . 

 Apparatus for experiments on polarised light described . 



Approach of the earth to meet a falling body . . . 

 Applications of the expansion of solids to the arts . . 



Arago and Fresnel, their experiments on the interference of po- 

 larised light ........ 



Archimedes' screw, description of .... 



Areometer, principle and use of . . . . . . 



Parcieux's 



POLAR. OF LIGHT 



MECHANICS, t. i. 

 HEAT 



. 34 

 58 



1518 



8 



. 8 



POLAR. OF LIGHT . 37 

 HYDRAUL. 7. MECH. t. ii. 54 

 HYDROSTATICS . 13 16 

 . 15 



