236 Meteorological Summary for 1825.—Hampshire. 
Least monthly quantity in January. . . . 0°76 In. 
Total amount for the year. 2... . . 46.61 
Rain. 
Greatest monthly depth in December. . . 5°325 
Least monthly depth in July. . . . . . 0°180 
Total depth near the ground for the year . 30°450 
Total depth 23 feet high, for ditto. . . . 27:200 
N. B. The barometer is hung up in the observatory 50 feet 
above the low-water mark of Portsmouth Harbour; and the 
self-registering horizontal day and night thermometer, and De 
Luc’s whalebone hygrometer, are placed in open-worked cases, 
in a northern aspect, out of the rays of the sun, 10 feet above 
the garden ground. The pluviameter and evaporator have re- 
spectively the same square area: the former is emptied every 
morning at 8 o’clock, after rain, into a cylindrical glass gauge 
accurately graduated to 1-100th of an inch; and the quantity 
lost by evaporation from the latter, is ascertained at least 
every third day, and sometimes oftener, when great evapora- 
tions happen by means ofa high temperature, and dry northerly 
or easterly winds. 
BarometricaL PressurE.—In consequence of the high 
pressure of the atmosphere during the first three months, also 
in June and July, the mean height of the barometer is greater 
this year by 79-1000th of an inch, than the mean of the last 
eleven years. This was the case in every part of the country 
with some little differences. The aggregate of the spaces de- 
scribed by the alternate rising and falling of the mercury is 
15°89 inches less this year than last, and the number of changes 
seven less, which indicate a comparatively uniform pressure. 
For 177 days in which the moon ranged in North declina- 
tion, the pressure was 3-200ths of an inch greater than that 
in the 177 days in which she ranged in South declination. 
TEMPERATURE.—The annual mean temperature of the ex- 
ternal air is exactly one degree higher than that in 1824, and 
1:39 degree higher than the mean of the last ten years. The 
mean temperature of June, July, August and September was 
high, and these months were dry, particularly July, when we 
experienced oppressive heat for several days: but the spring 
and autumn were rather cold, which in great measure equa- 
lized the annual average temperature of 1824 and 1825. 
The annual mean temperature of spring water at 8 o’clock 
A.M. this year, is nearly a degree and a half lower than the 
annual mean temperature of the external air. 
Winv.—The crossing and opposite winds, or upper cur- 
rents, have been found to prevail very much this year. 
! In 
