( 8 ) 



The mean solar hours, which were respectively nearest to 

 the several lunar hours, were then computed for every lunar 

 day, a lunar day being the time between two successive superior 

 passages of the moon, and a lunar hour being the 24 th part 

 of a lunar day. 



The values of b — b' found for each solar hour were then 

 inscribed in tables of the lunar days and the lunar hours, in 

 such a way, that the value of b — b' found for a particular 

 solar hour was inscribed on the lunar hour, the nearest to 

 that solar hour. The means of b — b' at the several lunar 

 hours in each month were then taken and these means were 

 finally arranged in periods of six months, yielding mean values 

 of the barometrical variation at the several lunar hours for 

 each half year. 



The final results obtained by General sabine showed the 

 existence of a barometrical maximum at the lunar hours of 

 and 12, the hours of the moon's superior and inferior passage, 

 and a minimum at 6 and 18, the hours of the rising and 

 setting of the moon, with a corresponding progression at the 

 intermediate hours. 



Captain elliot deduced nearly the same result from obser- 

 vations made at Singapore from the beginning of 1841 to the 

 end of 1845 (Sec. Phil. Trans, for 1852, I, 125). The 

 method employed by Captain elliot in the discussion of the 

 Singapore observations was the same as General sabijve's. 



Dr. neumayer discussed in the same way a series of hourly 

 observations of the barometer made at Melbourne from March 

 l&t, 1S58, to February 28*, 1863, (See Proceed. Eoyal 

 Society, XV, 489). But the results obtained by Dr. neumayer 

 are not decisive. 



Por the two stations St. Helena and Singapore the existence 

 of the Lunar Atmospheric Tide, dependent on the hour angle 

 of the moon, may be taken as having been proved beyond all 

 doubt. But nothing more than this has been proved; the 

 particular features of the phenomenon, the relation existing 

 between the different positions of the moon, relatively to the 

 meridian, and the variation of the barometric pressure in the 

 lunar day could never be brouglit to light by a method of 



