62 STATEMENT AND EXPOSITION OF 



Case 2(i, or Case 4ith. 



No. 161. — Evening of May 29th, 1854; 3 days after new moon. 



No. 237.— Morning of October 30th, 1854; 2 days after first quarter, 



Examjples under Case 3(/. 



No. 212. — Evening of Sept. 12th, 1854; 1:^ day before last quarter. 

 No. 213. — Evening of Sept. 13th, 1854; | day before last quarter. 



Examjjles under Case 4:ih. 



No. 18. — Evening of June 29th, 1853; 1| day after last quarter. 

 No. 60. — Morning of Sept. 30th, 1853; 2| days before new moon. 

 No. 215. — Evening of Sept. 16th, 1854 ; 2 days after last quarter. 



Examples under Case 5th. 

 No. 67. — Morning of Oct. 8th, 1853; 1 day before first quarter. 

 No. 214. — Evening of Sept. I4th, 1854; day of last quarter. 

 No. 239. — Evening of Nov. 11th, 1854; 1 day before last quarter. 

 No. 241. — Evening of Nov. 13th, 1854; 1 day after last quarter.^ 



(88) Mr. Jones also gives examples of " Moon Zodiacal Light." 



(89) Baron Humboldt, commenting on Rev. Mr. George Jones's observations, 

 quotes from his own ship-journal on his voyage from Callao to Acapulco, and 

 speaks of the brilliancy of the Zodiacal Light as exceeding anything which he had 

 previously witnessed. The time when this was observed was from the 17th to the 

 19th of March, 1803. Lideed the intensity of the light increased for five or six 

 nights after the 14th. Height 39° 57 



As the moon was new on the 23d, this bright light must have begun before the 

 last quarter ; and will present a probable instance of Case Sd, passing into and 

 beyond Case 5th. 



But, strangely enough, Baron Humboldt finds occasion to add : " We did not 

 see the Zodiacal Light the 2()th and 21st of March, although the nights were of 

 greatest heanty.^^ 



Now something — perhaps not a little — of that may have been due to differences in 

 the state of moisture of the atmosphere, such as those, (72), of which Col. Forshey 

 has informed us. But the time being withal from two to three days before the new 

 moon, the sun's light would, on the hypothesis here in question, be transmitted 

 through the curved portion of the girdle a little in advance^of the longer axis. 



The length of the transmitted portion would not be great, and the upper end 

 would set almost as soon as the twilight ended. 



(90) In the account of Prof C. Piazzi Smyth, Astronomer Royal at Edinburgh, of 

 his expedition to Teneriffe, under date of Aug. 19th, 1856, speaking of the Zodi- 



" See AstronomiHche Nachrichten, No. 989. 



' The dates with reference to the phases of the moon are but close approximations ; yet such as 

 arc quite sufficient. 



