the oscillation cluriog the period of these observations has been greatest in the winter half-year (9 a. m. to 4 p. m.) 
= , 0278 , and least in the summer half-year (4 p. m. to 10 p. m.) ~ .0188. The colamn for 9 a. m. contains the 
monthly means at that hour for 1832^, reduced to Fo 
8 
REPORT OF 
P. M 
