ERRATA. 



Page 70, line 5 from bottom : 



far "Robert" read "Charles." 



Page 286, line 10 from bottom : 



for "Sir William Herschel " read "Sir William 

 James Herschel, eldest son of Sir John 

 Herschel." 



for " Foulds " read " Faulds." 



Page 291 , line 11 from top : 



for " Thompson " read " Thomson." 



