340 



On the retrograde Variation of' the Compass. [Mat, 



Table containing the Mortiinjr, Noon, and Evening Monthly 

 Mean Variation of the Magnetic Needle for three Years. — 

 Variation West. 



Table containing the Mean Variation of each twelve Months' 



Observations. 



( Morn 



lilyear.' Noon 



( Even . 



;dvear 



TMorn . 

 < Noon . 

 (_Eveu., 



