CONTENTS OF THE SECOND YOIXME. 



CHAPTER VI. 



ON THE KINETIC OK MECHANICAL VIEW OF NATURE. 



The idea of motion in ancient philosophy, 3 ; Descartes' development of the 

 kinetic view, 6 ; Huygens and Newton, 7 ; Revival of the kinetic view 

 in the nineteenth century, 7 ; Young and Fresnel, 8 ; UnduLttorj- and 

 emission theories, 11 ; Doth theories kinetic, 11 ; Undulatory theory 

 prepared by acoustics, 12 ; Newton's authority on the side of the emission 

 theory, 14; But also suggests the other theory, 15; Biot, BrewHter, 

 and Laplace against the undulatory theory, 16 ; Euler the suceeabor of 

 Huygens, 16; Young, 16; His "general law of the interference of 

 light," 18 ; Theory of the luminiferous ether, 18 ; Brougham's attack on 

 Young, 19 ; Augustin Fresnel, 21 ; Difficulties presented by the jwliir- 

 isation of light, 22 ; Fresnel's Memoir on Ditfi-action, 25 ; Young and 

 Fresnel introduce the conception of transverse vibrations, 28 ; Mechani- 

 cal difference between light and sound, 30 ; The proi)ertie8 of the ether, 

 31 ; Other kinetic theories, 34 ; Kinetic theory of ga.ses, 34 ; Vortex 

 motion, 35 ; Faraday's researches, 35 ; Problems aa to tlie nature of the 

 ether, 36 ; The theory of elasticity, 40 ; The problem of the ether may 

 be treated mathematically, 44 ; or experimentally, 44 ; Necessity of 

 combining the two methods, 44 ; Spectrum analysis, 45 ; Tl>e rlue 

 furnished by the phenomena on which it depends, 47 ; Sir 0. St<>ki>«, 

 47 ; (iustav KirchhofF, 48 ; Explanation of fluorescence, 52 ; View of (he 

 ether as an "elastic solid," 54 ; Lord Kelvin's rcseiux-lies, 55 ; Tyndull'* 

 ' Heat,' 57 ; Lord Kelvin's vortex theory of rnalltT, 57 ; Heiuiholi*'* 

 investigations, 58 ; Earlier researches on vortex motion, (51 ; IufluoiKX» 

 of Helmholtz's investigations in England, 62 ; Difl^icultjos of liio vort<«x 

 ring theory, 64 ; Modern view of electrical plienomcna : KanuUy, 6«3 ; 



