Meteorological Summari/ for 1826.— Hampshire. 157 



Pluviameter and Evaporator have respectively the same square 

 area : the former is emptied every morning at 8 o'clock, after rain, 

 into a cylindrical glass-gauge accurately graduated to -p^dth of an 

 inch ; and the quantity lost hy evaporation from the latter, is ascer- 

 tained at least every third day. 



Barometrical Pressure.— The mean altitude of the Barome- 

 ter this year very nearly coincides with that of last year, and in 

 these two years it is unprecedented in our register, arising from a 

 more settled state of the atmosphere in the summer and winter 

 months. The maximum pressure is not so high as that of last year 

 by Voths of an inch ; but the minimuvi pressure is exactly the same. 



The aggregate of the spaces described by the alternate rising and 

 falling of the quicksilver, is 24-71 inches less than in 1824, and 8-82 

 inches less than that of last year. 



For 201 days in which the moon ranged in North declination, the 

 mean pressure was ^th of an inch higher than in the 183 days in 

 which she ranged in South declination. 



Temperature.— The annual mean temperature of the external 

 air is -truths of a degree higher than that of last year, and 1-42 de- 

 gree higher than the mean of the last ten years. As it respects 

 the temperature of the atmosphere there were two singular devia- 

 tions from the regular course of the seasons this year : namely, the 

 mean temperature of February was about one-third of a degree 

 higher than that of March ; and the mean temperature of Decem- 

 ber was 1^ degree higher than that of November. The mean tem- 

 perature of spring water at 8 o'clock A.M. this year, is 1-70 de- 

 gree lower than the mean temperature of the external air ten feet 

 from the ground ; and for the last six years it is 1-09 degree lower. 

 With the exception of the genial year 1822, this year has been the 

 warmest that we have experienced for a great number of years past. 



Wind. — During the first four months, and in September, we had 

 a long continuance of brisk and hard gales ; the other part of the 

 year, particularly the last three months, very iew gales prevailed. 

 The number of strong gales, or the days on which they have pre- 

 vailed this year, are as in the following scale. 



Those from the N.E. and S.W. points of the compass are equal; 

 and both together, more than two-thirds of the whole number ; and 

 they are diametrically opposite. 



In comparing the scale of the ordinary winds, it appears to coin- 

 cide nearly with the scale for last year, except from the West points, 

 the loss on which seems to have gained upon the North wind. Here 

 the prevailing wind for many years past is decidedly from the South- 

 west and West points, as influenced by our local position with re- 

 spect to tlic Western Ocean. 



Weather, 



