LIGHT SCIENCE EOE 

 LEISURE HOUES. 



A SEEIES OF FAMILIAR ESSAYS 



ON 



SCIENTIFIC SUBJECTS, NATURAL PHENOMENA, &c. &c. 



BY 



EICHAED A. PEOCTOE, B.A. CAMB., F.E.A.S. 



AUTHOR OP 

 ' THE SUN ' ' OTHER WORLDS THAN OURS ' ' SATURN ' ETC. 



I bear you witness as ye bear to me, 

 Time, day, night, sun, stars, life, death, air, sea, earth.' 



SWINBURNE. 



LONDON: 



LONGMANS, GrEEEN, AND CO. 

 1871. 



