( ia ) 



TABLE II. 



Differences be- 

 tween the meaus 

 of the Maxima 

 and the means of 

 the Minima. 



Apogee 



Perigee 



For the periods of 

 New Moon lst Quad. 



Pull Moon. 



mm 



0.122 



mm 



0.137 



mm 



0.130 



mm 

 0.132 



mm 



0.124 



2d Quad. 



mm 



0.117 



As each of the periods comprehends onlj a small number of 

 days, the same calculations have been made for periods com- 

 prehending the days of apogee with the two preceding and the 

 two following days; the same has been done for the other pe- 

 riods. The results are contained in Table III. 



TABLE III. 



For the periods of 



Apogee Perigee 



New Moon 



lst Quad. 



Full M( 



2d Quad. 



Differences he- 

 tween the means 

 of the Maxima 

 and the means of 

 the Minima. 



mm 



0.L00 



mm 



0.122 



mm 



0.141 



mm 



0.13J 



mm 



0.102 



mm 



0.102 



These numbers show that the range of the Lunar Atmosphe- 

 ric Tide is larger for the days of the perigee than for the days 

 of the apogee. The same result was found by General sabine. 

 The numbers contained in the 4 th , 5 th , 6 th and 7 th columns 

 show that this range is also very different at the different pe- 

 riods of the phases of the moon. General sabine has only com- 

 municated the range of the Lunar Atmosphenc Tide for the 

 periods of syzygy and of quadrature ; for these two periods the 

 range was nearly the same. The mean of the numbers of the 

 4 th and 6 th columns is mm .1215: that of the numbers of the 



