METEOROLOGICAL OBSERVATIONS. 625 



Spring, — The south and south-east winds are warmest, and the 

 west the coldest, but the diiFerence of temperature is very small for 

 even the extremes. 



Slimmer. — There is very little variation in the temperature 

 throughout the summer, the mean value being 39-67° F. 



The force of the wind was very much greater from the north 

 than from any other quarter ; with the exception of the Avinds 

 between the north and north-east all the winds were very light. 



Taking the means for the different winds through the year, it is 

 seen that a change in the direction of the wind affects the 

 barometer very little. It also appears that in autumn the north 

 wind is warmer than any other, and that, taking the mean of the 

 four seasons, the south-east, the south^ the north-east, and the north 

 are the warmest winds. 



The Barometer, 



The mean daily changes of the barometer show that — 



In ivinter the barometer is highest at 10 a.m., and diminishes 

 very regularly through the day and until midnight, after which 

 hour it rises as steadily until 10 a.m. ; the whole variation being 

 about '03 inches. 



In spring there is a gradual rise of the barometer from 4 a.m. 

 to 12 noon, then a gradual fall from noon until 10 p.m. ; between 

 10 p.m. and 4 a.m. the pressure remains constant, and the whole 

 variation is about • 02 inches. 



In summer there are two daily maxima, at 12 noon and 12 mid- 

 night, and two minima, at 4 p.m. and at 2 a.m. ; but the total 

 change is less than '01 inches. 



In autumn the barometer is highest about 11 a.m., and falls 

 until 4 p.m., then rises and is steady from 6 to 8 p.m., then falls 

 again to its lowest level at 2 a.m. ; but the whole variation is *01 

 inches. 



In considering the monthly changes, it appears that the baro- 

 meter rises rather rapidly (about • 3 inches) from January to March, 

 being then at its highest ; then falls rapidly to April and keeps 

 steady until June, then falls rapidly to its lowest in July and as 

 rapidly rises to August, then slowly falls again about ' 1 inches 

 from August until January, its second minimum 



The barometer was very little affected by storms. On Dec. o, 

 whilst a very severe storm from the north was coming on, the 

 barometer remained quite steady ; but while its force was at the 

 greatest the barometer rose gradually, and continued to rise as the 

 storm abated. When it became calm and the wind changed to 

 south for an hour, the barometer fell a little, but afterwards 

 continued to rise. 



The temperature continued steadily to increase from the 

 beginning of this gale, and when the wind changed increased more 

 rapidly, and came down, again with the south wind, to increase 

 again as the wind returned to the north. 



36122. R R 



