382 A. D. Bache on the influence of the Moon, on the 



eleven (or ten) year inequality, and secular change, are all elim- 

 inated, leaving numbers titled for the research of the lunar effect. 

 The readings taken in the month of June, 1840, have not 

 been used in the discussion, nor in the two preceding parts, be- 

 cause of the imperfect manner in which the allowance for the 

 progressive change could only be made at that time. For the 

 lunar hour 21 in July, 1840, the number of differences is so 

 small that the mean 'had necessarily to be reduced, and only 

 one fourth of its amount was set down in the table. In Jan- 

 uary, February, and March, 1843, the observations were discon- 

 tinued, excepting a single daily reading. Those months are 

 therefore not included in the lunar discussion. 



Ta3Le No. 8.— Recapitulation of the annual means exhibiting the lunar diurnal 



,u>,to.uwJ^^r'! 1 1 i , : 4 U ! , !, 1 8 1 9 !io Ijli 



ib4o-'4. ' -o'4 +0-5' +,.5 -0-3 -o-i +0-3 -2-4 -.-3; -.-5; -0 2 +.-3 -0 . 



i84r-M2 +I-. +2-o:+25 +0-9 +o-3 +i-. +07 -rr -0 41 -.-3 -O'^ +• 







-o-3i+o-4 +3 3 +0-. -0-8 -1-2 -ou 



i844--45:-o9,+o6l+o-5 +o-3 o-o 



+ o.6Uo.6+0 9+o-> -0-3 0-0+02 





T;77|^o,T^:-i^d-i^£:!>^ 





18 





15 1 16 



17 18 ! 19 



00 1 21 1 22 i 23A 



i84o-'4. +I-0 



+0-8 





+0-4I-0-. 



+0-6 -.-3: -,-3 



+o-6!-2-J+o6'+r;' 









-i-5|-o-6 







i842-'43 +01 











-o-3-««i+n °;; 











zf,\:Zi'ol 









+0-5 



o-o -0-7 





Mean,:+0 7'-f-o-2 



+0-4 



-o3i+o-. 



-0-7I-1-3 -0-6 



-o-5_-jJ^^^}_^lJ 



>ry near jr 

 from the 



.^.^.«., „u^ ..,0 for the last year. A genera 

 fever shows that owing to the disturbing efica 

 ve change, the monthly means are 

 derived either from the bi-hourly < 

 [t is also shown in the sequel that tne xu-- 

 arly the same in the summer and winter 

 seasons. , 



A comparison of the values of table No. YIII ^^^^S ^f^ 

 selves, shows them to be very irregular, although derived roi 

 mat»y thousand observations. A live vear series of observations 

 ' ' " ■ hibit a tolerably regular progressio • 



. groups have been formed, one 

 .0 to 1843, comprising 8^9^ observa 

 naining two years, comprising l^-^ 



5 barely sufficient to e 

 In the following table tv 

 results from three years, II 

 tioas; the other from the r 



