482 BARON VON WREDE ON THE ABSORPTION OF LIGHT. 



= r (1 — ?•) - o sin 2 TT I < — l cos ti . 



— cos 2x1 t — — I sm n . I. 



V x; \ J- 



The velocity of undulation U, which the particle of aether acquires 

 through the action of the collective systems of waves of light, must 

 now be : 



and therefore 



U=a{\ —rY |sin2 7r (t- ^\ FrH- r* cos 2 tt — 



o o 2^< , 2« 9,h~\ 



+ r* cos 2 . 2 TT \- ... r cos « . 2 tt — I 



X \ J 



— cos 2 TT I < — — J r- sm 2 TT — 

 \ \) I \ 



+ 7-^ sin 2 . 2 TT — - + ... r sin « . 2 tt — . 

 X X J 



If we now assume 



a{\ -ry r 



9 f) 9h 



1 + »•= cos 2 TT ^ 4- r^ cos 2 . 2 X — 

 X X 



2« n 2 61 . 



+ ... r cos w . 2 TT — = ^ . cos i 



o(l -r)'!" 



o • o 26 . , . „ o 26 

 r^ sm 2 TT — + ^"^ sm 2 . 2 TT — 



X X 



2" . ^ i w I ^ 



+ ... r sm w . 2 TT — — == -4 



'1-1 = 



0) 



,.(2) 



we shall have 



;7=.4.sin r 27r (<--) -i 1 ....(3) 



The system of waves of light thence resulting will be quite of the same 

 nature as the original, only that it has a different intensity and a diiferent 

 position. 



(To be continued.) 



