368 Dr, Burmy's Meteorologicaljournalkept at Gosport . [May, 



I Number. 



Small meteors, or shooting* stars 131 



Lightning, days on which it occurred 14 



Thunder, days on which it occurred 6 



Evaporation. 



Inches. 



Greatest quantity in June 4-30 



XiCast quantity.in January 0*35 



Tjiatal amount for the year 29*35 



Rain, S^x. 



Inches. 



Greatest quantity in October 4-10 



Least quantity in March ,. . . 0'46 



Total amount for the year 25*75 



N.B. The barometer is hung up in the Observatory, about 30 

 feet above high-water mark ; and the Self-registering Horizontal 

 Day and Night Thermometer, and De Luc's Whalebone Hygro- 

 meter, are placed in open-worked cases, in a northern aspect, 

 out of the Sun's rays, and 10 feet above the gai;den ground. 

 The pluviameter and evaporator have respectively the same 

 square area : the former is emptied every morning at 8, a.m. after 

 a precipitation of rain, into a cyUndrical glass guage accurately 

 graduated to 1-lOOth of an inch ; and the quantity lost by evapo- 

 ration from the latter, is ascertained at least every third day, 

 and sometimes oftener, when strong evaporations happen by 

 means of a high temperature and very dry winds. 



Of the Pressure. — The barometrical or mercurial column in 

 the course of the year has shown a great elevation, and an unu- 

 sual depression ; the former occurred in January, the latter in 

 October, making its range about 2-} inches. The mean pressure 

 is l-125th of an inch less than it was in either of the two preced- 

 ing years; but the average of all the monthly ranges 2+ inches 

 gffpater. The number of changes is nine less than in 1819, but 

 it exactly agrees with that of 1818. For 180 days, while the 

 moon was in south dechnation, the barometrical mean is about 

 l-20th of an inch higher than in the 186 days of her north 

 declination. Last year the barometrical mean, or mean pres- 

 sure, was greater while she was in north declination, than while 

 she ranged in south declination, by 1-1 7th of an inch. This 

 shows nearly an equal pressure of the incumbent atmosphere for 

 her north and south dechnation during the last 26 lunations, and 

 has but little tendency to establish " the periodicity of atmo- 

 spherical changes," said to be influenced by the moon in the 

 different parts of her complex orbit, unless the mean results 

 shpuld happen to come out more favourably to the hypothesis, 



