XCIX. 



ENGLAND. GREENWICH. Lat. 51 29' N. ; Long. 0'. 



Corrections to be applied to the Means of the Hours of Observation, or Sets of Hours 

 to obtain the true Mean Humidity for the respective Months. (GLAISHER.) 



Thousandths. 



E 



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



120 



