640 LXX. 



RUSSIA. HELSINGFORS. Lat. 60 10' N. Long. 24 57' E. 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. 



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



76 



