Pbessuee of the Wind. 



427 



Annual Variation of the meaa Pressures of Wind. — It will be seen that the means at the foot of 

 Table XXVI. vai-y in the same way as the means at the foot of Table XXV. The means for each of the 

 meteorological quarters and for the year are as follow : — 



lb. 

 Winter, Dec, Jan., Feb., 0-27 



Spring, March, April, May, 0-38 



lb. 



Summer, June, July, Aug., 0'34 

 Autumn, Sept., Oct., Nov., 0'51 



lb. 



The mean pressure for the year 1844, 0-37 



The mean pressure of the wind is greatest in autumn and is least in winter, as before. 

 The monthly means of the maximum pressures (foot of Table XXV.) bear to the monthly means of the 

 approximate mean pressures (foot of Table XXVI.) the following ratios : — 



TABLE XXVII. — Mean Pressure of Wind with reference to the Moon's Age and Declination 



in 1844. 



Table XXVII. has been formed from Table XXVI. in the manner already described for Table II. of the 

 magnetical results. 



Pressure of Wind with reference to the Moon's Age. — The means of groups for the first portion of 

 Table XXVII. are as follow. 



lb. 

 12 days to 18 days, Full Moon, 0-23 



15 22 ... 0-43 



19 26 - 0-51 



23 29 ... 0-47 



lb. 

 27 days to 3 days, New Moon, 0-42 



7 ... 0-36 



4 11 ... 0-36 



8 14 ... 0-26 



The pressure of the wind in 1844 was a minimum at full moon, and it was a maximum about 5 days be- 



fore new moon 



