24 GENERAL INDEX. 



Page 



Circular polarisation in quartz . . . . . POLAR. OF LIGHT . 41 



in amethyst . . . . 42 



in fluids . ..... . 45 



double refraction, concerning . . , , .. . 44 



Classes of science discriminated PRELIMINARY TREAT. . 2 



Classification of machinery ....... MECHANICS, t. ii. . 3 



CocMion, or Archimedes' screw described .... HYDRAUL. 7. MECH. t. ii. 54 



Cohesion, quantity of its effect on friction determined . . MECHANICS, t. iii. . 10 



Coloured rays of light, remarks on . .... PRELIMINARY TREAT. 23 



rings, double system of . . . . . . POLAR. OF LIGHT . 23 



. . . . positive and negative systems of . . . 21 



. . . . general law of the phenomena . . . . . 27 



.. .. system of, produced by common light . . . 28 



of the Apophyllite, extraordinary system of . 32 36 



. . splendour of, as seen in the topaz . . . 23 



of topaz, virtual poles of .... . 33 



in Rochelle-salt ..... . 33 



. . hypo-sulphate of lime ..... . 35 



. . leucocyclite ...... . 34 



Vesuvian or idocrase .... . 35 



shadows, explanation of . . . . . OPTICS . . 66 



Colours, accidental, phenomena of ..... . 46, 48 



theory of ... . . . , . . 66 



of bodies changed by heat ..... . . .63 



light . . 64 



the atmosphere and sky accounted for . . . , . . .65 



mother of pearl accounted for .... . . 38, 40 



. . . . communicable by impression . . . , .38 



natural bodies, cause of ..... . . 59 



indistinguishable by certain eyes, curious account of . . . .49 



thin plates and films, causes of . . . . . . . 33 



of air, water, and glass, tables of . . . . .35 



. . ' thick and of double plates . . . . . . . . 36 



the original particles and fibres of bodies . . . . . .37 



primary of the rays of light . -- . , 23 

 produced by the action of crystallised bodies upon 



polarised light ...... POLAR. OF LIGHT 18 20 



and systems of rings produced by crystals . . . 20 23 



, . of polarised light, cause of . . . . . . 36 



Blot's theory of moveable polarisation . 37 



Combination of frigorific mixtures, tables of .... HEAT . . .62 



forces, concerning the results of ... MECHANICS, t. i. . 3 



wheels and axles, different ... . . t. ii. . 27 



of axes of double refraction . . , POLAR. OF LIGHT 29, 30 



of doubly refracting glass plates, effects of . . 55 



of rectangular glass plates, effects of . . . 50 



Common balance, principles of . , MECHANICS 14 



light distinguished from polarised .... POLAR. OF LIGHT ' . 8 



system of coloured rings produced by . , . 28 



Communication of double refraction to glass by heat . . . . 48 



to glass plates by mechanical force . 55 



of a permanent doubly refracting structure to glass . 52 



Comparative anatomy, objects of PRELIMINARY TREAT. 12 



temperature of the prismatic rays, table of . . OPTICS . . .29 



Comparison of the centigrade and Fahrenheit scales of thermometers HEAT . . 4 



Compensation balance, Arnold's account of .... . . 19 



f wheelwork, concerning MECHANICS, t. ii. . 26 



t parts of bodies, investigation concerning . . OPTICS . . .60 



on of forces, the effects of ..... MECHANICS, t. i. . 2 



of motions , . 4 



of calcareous or Iceland spar .... POLAR. OF LIGHT . 1 



'levers, principles of MECHANICS, t. ii. . 10 



microscopes OPTICS . . .15 



nlity in general, concerning .... PNEUMATICS . 1 



Of Water ..... . Hvnpns TATT^C. . ] 



air, experiments on ..... 

 its use described 

 powers of different kinds of wood, tables o'f . 



