i6 A VOYAGE TO Book I. 



error of the courfe with regard to the difference of me- 

 ridii.uS being corrected from the obfervations of the 

 fathers Laval and Feuillée. 



Variations ohferved hy Don George Juan, the Longitude 

 being reckoned weji from Cadiz. 



Variatiojis ohferved hy the Author, the Longitude heing 

 reckoned from the former Meridian. 



To the above obfervations on the variation of the 

 needle, compared with thofe on the variation chart, firft 

 publillied by the great Dr. Halley in 1700, and cor- 



re(iled 



