34 



GENERAL INDEX. 



t. i. 



t. ii. 



POLAR. OF LIGHT 

 MECHANICS, t. i. 



Motion of friction of bodies in . . . , , , MECHANICS, t. in. 



methods of changing its direction , , , , t. ii. 



parallel, described ....... 



Motions, composition of , . . , 



Moveable pulleys ....... 



polarisation of light, Biot's theory of , , 

 J\fover, first, explanation of the term , . . . 



Moving bodies, ratio of their powers . , , . , , 



experiments on . . ... 



Mountains in the moon, their height capable of being measured PRELIMINARY TREAT. 

 Multiplication of images in calcareous spar . . . POLAR. OF LIGHT 



. . . cause of . . . 



explanation of . 



. t artificial imitation of . 



Murray's (Dr.) proposed scale for thermometers . . . HEAT . 



Muscipula, or fly-catcher, description of that plant . . PRELIMINARY TREAT. 



10 



5364 

 59 

 4 



. 33 

 . 37 

 . 2 

 7 



17 



61 

 61 

 61 

 62 

 18 

 32 



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



Natural bodies, colours of . . . . . OPTICS . . .59 



history, objects of ....... PRELIMINARY TREAT. 12 



philosophy ....... 2 8 



Nature, or cause, of heat ....... HEAT ... 1 



and properties of light ...... OPTICS . . 1 



Nautilus, description of that curious shell-fish . . PRELIMINARY TREAT. 31 



Negative and positive axes of refraction explained . . POLAR. OF LIGHT . 2 



systems of coloured rings . . . . 21 



Nepenthes distillatoria, a singular plant . . . PRELIMINARY TREAT. 32 



New species of double refraction in Analcime . ... POLAR. OF LIGHT , 39 



Newcomen's steam-engine described ..... MECHANICS, t. i. . 32 



Newton's table of colours of thin plates and films . . OPTICS . . 35 



scale, its deviation from that of the polarised tints . POLAR. OF LIGHT . 32 



Objects, intermission in the vision of, when seen obliquely . OPTICS . . 43 



of mechanics ..,... MECHANICS, t. i. 1 



visible, duration of .... t . OPTICS . 42 



Oblique ropes with pulleys, concerning . . MECHANICS, t. ii. . 39 



Ocular spectra, or accidental colours t . . . OPTICS . . 46 



Oil of turpentine, boiling point of . . . . , . HEAT . 51 



Opaque bodies, method of measuring their refractive powers . POLAR. OF LIGHT . 12 



Optic axis, different positions of, for different coloured rays . 



Optics, definition of ....... PREL. TREAT. 20. OPTICS 1 



Ordinary and extraordinary rays distinguished . POLAR. OF LIGHT . 2 



refraction, polarisation of light by , , . 13 



Ornaments, iris . ..,,. OPTICS . . 40 



Oscillation, centre of ....... HYDRAULICS . 28 



Ostrich, mode of hatching its eggs , . , , PRELIMINARY TREAT. 31 

 Overshot water-wheel . . . . . . HYDRAUL. 24. MECH. t. i. 19 



proper velocity of . , . MECHANICS, t. i. . 21 



Pala de vaca, or cow-tree, account of .... PRELIMINARY TREAT. 33 



Panes of glass, how flies are enabled to walk upon . . 26 



Parabola, descriptjon and properties of that curve . . 6 



Paraboloidal surface, proper for the mirrors of reflecting telescopes OPTICS . . 22 



Paradox, definition of the term ..... HYDROSTATICS . 6 



hydrostatic, explanation of ..... 5 



Parallel motion, description of . MECHANICS, t. ii. . 59 



Parcieux's areometer described .... HYDROSTATICS . .15 



Parhelia, phenomena and causes of , . . . OPTICS . .52 



Paris' s (Dr.) thaumatrope, a curious optical toy . . . 



Particles, minute, of bodies, colours of . . .37 



Passive forces. See Active forces. 



Pearl, mother of, its structure explained .... . 



its colours communicable by impressions . 39 



Peculiarity in the expansion of water . . . . . . . . HEAT . . .12 



Pencils of light, formulae of M. Malus for their intensity . POLAR. OK LIGH~ lf * 



Pendulum, application of the cycloid in its construction . . PRELIMIN*- 



gridiron, by Harrison, account of . HEAT 



Percussion, centre of, explained , . . . HV 



