Calendar of Nature, 181 



the 9th what appeared a heavy storm passed over to the north-east, but 

 no thunder was heard here. The evaporation 0*2 of an inch. 



August. The same similarity to the weather of 1823, noticed last month, 

 occurred again in this ; the minimum of the thermometer the same, and 

 the range only F greater than at that time ; the mean, however, was less 

 than any one in the last 13 years ; the month was consequently cold, and 

 the quantity of rain was unusually great, being only exceeded by the quan- 

 tity which fell in last August. From the 22d to the 28th were continual 

 gales of wind from the west and north-west, and nearly half the rain fell in 

 that time. Thunder heard about midnight of the 27th. The evaporation 

 0-39375 of an inch. 



Se2^tember. On 19 days rain fell, and the total quantity was greater than 

 in the last 3 years ; the mean temperature below any one in September 

 since 1820, and the maximum lower than ever noticed, by the journalist, 

 in the same month. A corresponding depression was observed in the baro- 

 meter, the mean being lower than for 13 years. Thunder heard on the 

 12th and 15th. The evaporation 0*3125 of an inch. 



October. The month was distinguished by a remarkably early fall of 

 Snow, the earliest that has occurred during the journalist's observations. 

 The 6th was a fine autumnal day ; on the next morning rain fell for some 

 little time, when snow followed for some hours but did not lie ; the quan- 

 tity of rain and melted snow on that day was nearly half an inch. The 

 mean temperature of the month lower than since 1823, another instance of 

 the similarity of the weather in the two years. The barometer lower than 

 last year, but above the average of the month ; the whole quantity of rain 

 and melted snow less than usual j the wind between north and west during 

 the greater part of the month. A lunar halo, with misty area, seen on the 

 15th from 7 to 10 P.M. The evaporation 0*15 of an inch. The last very 

 early fall of snow was on the 21st of October, 1819. 



November. The mean temperature of the month below any one in the 

 same month during the last 7 years, although the maximum was above that 

 of 1826, and the extreme of cold not equal to that of last year ; the quantity 

 of rain less than for many years, with the exception of what fell in last 

 year. So small a range in the barometer has not occurred during the last 

 12 years ; the mean above the general average of the month, but not so 

 high as in 1827. About 6 in. of snow fell on the 24th, but was all melted 

 in 2 days. Lunar halos, with misty areas, seen on the nights of the 8th 

 and 9th. The evaporation 0*075 of an inch. 



December. The barometer during the month was very high, the mean 

 much above any one in the last 7 years, and the maximum higher than 

 since December, 1827, the range only 0*98 of an inch. The month was 

 also extremely cold, the mean being upwards of 10° below those of the 

 last 3 years. Snow fell on the 18th, 19th, 21st, 23d, 24th, and 27th ; the 

 whole quantity little more than 3 in. The rain and melted snow only 

 0*33125 of an inch, a quantity little more than one eighth of what fell m last 

 December, which was much less than usual. The evaporation 0*03125 of 

 an inch, 



SCOTLAND. 



Diagram. (Jig. 36.) , showing the Motion of the Mercury in the Barometer and 

 Thermometer, and the Dew Point, or the Mean of each, for every Ten Days 

 in December, 1829, and January, 1830; also the Depth of Rain in the 

 Pluviometer, and the Quantity of Moisture evaporated in the Evaporating 

 Gauge, for the same Period ; as extracted from the Register kept at 

 Annat Gardens, Perthshire, N. lat. 56° 23^', above the level of the sea 

 . 172 ft., and 15 miles from the coast, being the mean of daily observations 

 at 10 o'clock morning and 10 o'clock evening. 



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