RECORD AND DISCUSSION OF TEMPERATURES. 



37 



rH C-l (M 



4 c!, 



r-i (M (M 





These diagrams fully bear out the observer's remarks, viz: that the lowest tem- 

 peratures are reached about the time of full moon. Setting aside some small de- 

 viations in the regularity of the curves (of temperature), there is not a single 

 exception to the correspondence of relative maxima of cold near the epoch of the 

 full moon, and of relative minima of cold near the time of new moon. The period 

 between any two consecutive maxima of cold from five intervals is 25'^-. 2 + 1'' .9, 

 and the same between the minima of cold from four intervals 28'' .5 + 2'^- A, for the 

 first winter, and 28^.8 + l'^-. 5 (from five intervals), and 28'^ .8 ± S-'-.S (from five 

 intervals), for the second winter, respectively. Combining these four values with 

 the application of weights according to the respective probable errors, the resulting 

 period for the recurrence of cold becomes 27'^. 7 + I'^.O. The synodic period of the 

 moon is 29''. 5; somewhat longer than the period just deduced, but by no means 

 incompatible therewith. 



If we now follow the curve indicating the duration of the fall of snow, we find, 

 in the two winters, maxima near the period of new moon, thus accounting, in con- 

 formity with the previous investigation, for the rise in the temperature ; the 

 average elevation above the mean temperature for the six winter months, during 

 the hours of snow fall, being, according to the table, 13°. The superior maximum 

 of Dec. 27th to Jan. 1st (first winter), when it snowed during 44 hours, is particu- 

 larly instructive. 



The lower wavy line indicates maxima in the amount of serenity of atmosphere 

 near the time of full moon, better marked in the first than in the second winter. 

 The above special case of Dec. 29-30, is again interesting as conspiring to an ele- 



