IV. 



N. America. — Fkankfort Arsenal. Lat. 39° 57' N. Long. 75° 8' W. Greenw. 



Corrections to be applied to the Means of the Hours of Observation to obtain the true 

 Mean Temperatures of the respective Days, Months, and of the Year. — Dove. 



Degrees of Reaumur. 



E 



The numbers without sign must be added ; those with the sign — must be subtracted. 



J7 



