I. 579 



North America. — Washington, Lat. 38° 54' N. Long. 77° 3' W. Greetnv. 



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. 



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



15 



