Paga 236, line 3, for " experiments, " read experiment. 

 237, line 1, for "radiatory," read radiating. 

 237, line 19, for "An other," read Another. 



240, line 17, for "Br'X i -f |," read 5, r'X « 



241, line 29, for " surface," read stratum. 



242, line 3, for " the £," read £ the. 

 242, line 6, for " r," read z. 



242, line 6, for " integer," read improper. 



Errata in Mr. Alexander's Communication. 

 Fage 245, in © 7 s longitude at 8h 24m, for " I3°," read 23°. 



" in ©>s right ascension at 6h 24m, for " 3" 676," read 



3"076. 



246, in D ? s equatorial parallax, at 7h 22m 28sec. for " 57' 



40"6269," read 57' 40"6359. 



247, in D ? s long, at 4h 24m, for " 27"327," read 27"827. 

 " " in column of 1 st difference, for " 52 ;/ 376," 



read 42"376. 



" in D ? s latitude, at 4h 24m, for « 35' 8"338," read 

 45' 8"338. 



250, in the line commencing with " Digets eclipsed," for 

 "©'s SW limb," read ©'s SElimb. 

 " last line, supply an R in the word eratum. 

 The eye will also readily detect some unimportant errors in th« 

 second, third and fourth differences, in pages 245, 246 and 247. 



