LIGHT SCIENCE FOR 

 LEISURE HOURS. 



A SERIES OF FAMILIAR ESSAYS ON SCIENTIFIC 

 SUBJECTS, NATURAL PHENOMENA, ETC. 



BY 



RICHARD A. PROCTOR, B. A. CAMB., F. R. A. S. 



M 



AUTHOR OF 

 "THE SUN," "OTHER WORLDS THAN OURS," "SATURN," ETC. 



" I bear you witness as ye bear to me, 



Time, day, nigH sun, stars, life, death, a^ sea, earth." 



" **, * -,' \ - SWINBURNE. 



NEW YORK : 



D. APPLETON AND COMPANY, 



549 & 551 BROADWAY. 



1871. 



