LV. 627 



Prussia. — Halle. Lat. 51° 30' N. Long. 11° 57' E. Greenw. 



Corrections to he applied to the Means of the Hours of Ohservation 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. 



63 



