1868. 



I Chase. 



II. 



Mean of March and September (equinoctial), 



one month from equinoctial months, . 



one month from solstitial months, 



June and December (solstitial), .... 



III. 



December and JanuarJ^ (perihelion), . . 



November and February, 



October and March, 



September and April, 



August and May, 



July and June (aphelion), 



IV. 



November to February, inclusive (perihelion) 

 Sept., Oct., Mar., April (equinoctial), . . 

 May to August, inclusive (aphelion), . . 



V. 

 Mar. and April (1st, or N. vernal equinox), 

 Jan. to June, inclusive, " " 



Sept. and Oct. (2d, or N. autumnal equinox), 

 July to Dec, inclusive, " " 



VI. 



Oct. to Mar., inclusive (perihelion), . . . 

 April to Sept., inclusive (aphelion), , . 



VII. 



Var. of 

 Dbc. 



2' 93 

 2^74 

 2' 70 



2' 27 

 2M7 

 2' 74 

 3M1 

 3' 36 

 3' 12 



Spring, 

 Summer, 

 Autumn, 

 Winter, 



2^37 

 2^92 

 3^24 



2^82 

 2' 81 

 3' 02 



2^89 



2M9 

 3^20 



3' 06 

 3' 74 

 2^70 

 1^88 



VIII. 



Warm semester, 

 Cool semester, . 

 Year, . . . . 



3M8 

 2' 20 

 2^85 



liarom. 

 mean. 



756.41 

 756.40 

 756.30 



756.22 



757.00 



756.71 



756.37, 



755.95 



755.94 



756.10 



756.88 

 756.16 

 756.02 



755.49 

 756.. 50 

 756.82 

 756.19 



756.69 

 756.00 



755.63 

 756.06 

 756.40 

 757.29 



756.14 

 756.55 

 756.36 



The predominance, under some circumstances, of the lunar 

 over the solar magnetic action, which was pointed out hy Sa- 

 bine (Silliman's Jour. [2] xix. 424), is confirmed by Broun 

 (op. cit., p. 618), who also finds (p. 690) that tlie most brilliant 

 auroras are observed near the moon's opposition, notwithstand- 

 ing the brightness of the moonlight. The observations at Tre- 

 vandrum concur wdth those at other stations, in showing that 



