53^ TJlC .'^rnv 



or L . 

 ^^^le tha'" 

 mao 



j;e's 

 is 

 heory 

 .v-i'.ii by ^^■'^-' ^ril- 

 - acre aistinctly recognized 

 -restricted group out of a great 

 itted by th the imj is- 



selective 

 plainly intimated that the directi^.i c^.w^^ v^.ll^.l lii>" "'""-♦^ 

 '■■■■' made islik ^ ' " ■ ' ' ' 

 d maintaini I vibr 



■ c- 



)3.\ researches 

 ith his first determinatior 

 J, his modified Foiicault i. ,-,,.. .wv,, c,^ ll.v. ^^cvai 

 y auout 1878. ^ -■ .- ' ■ ' 



accoi' eison's 



■lelivery), 1 examination and preser 



the mos. ^ experiments looking- to the cK 



of Hght-velocity, either in a 

 ledium, t' ' :;r with a statemt 



ially as ; - solar para iie refer- 



ei: ories of light. It is a and useful 



conti 



'^h':- lie v,i Volume . .lI.w. Ionian ^^v^,.- 



.T^8I- 8:^81 



