OBSERVATIONS OF LUNAR OBJECTS. 279 



latter by Mr. Tratt ; also on August 6 by Mr. Elger. These observations 

 are in contrast with those of Mr. Gledhill, 1869, December 13 (see ante, 

 p. 278). 



>S'itr>ima»7/.— Sun's altitude 15° 23'-2 to 19° 2'-0 ; tint of floor 0-41, esti- 

 mated from curve. Streaks generally visible — the sector, arms of trident, 

 and a, 0, y, with /;, not quite so frequent, generally faint ; but on Oct. 13 

 Mr. Gledhill saw the streaks stronger in the S.W. On May 10, 1870, the 

 streaks were recorded as bright ; and on October 3 and 4, 1870, the floor 

 remained in a similar state, viz. dark, with the sector, although faint, strongly 

 contrasted with it. The N.W. part of the floor does not appear to have 

 attracted special attention on December 15, 1869, March 11 and 12, 1870, 

 nor on January 1 and March 1, 1871. 



Interval 60 to 72 hours. 



1870, May 10.— See interval 48 to 60 hours, ante, p. 277. 



1870, July 8.— Mr. Gledhill recorded the floor as bright, =0-33. The 

 sector and streaks a, ?, and e were seen as bright objects. He gives no 

 record of a bright N.W. floor. 



1870, January 12. — Mr. Gledhill writes, " Streaks all seen, but not so 

 bright as last night." Same evening Mr. Elger writes : — " Tracing No. I. 

 (see ante, p. 274, fig. 11) is from a drawing made about 7" 25", which, as far 

 as all the markings are concerned, scarcely difl'ers from No. II. for December 

 1869. [In the tracing for Dec. 15, 1869, the one referred to (see fig. 13, 

 p. 283), the streak y is absent and the brightness on the floor adjoining the 

 west border.] I noted the sector as the plainest and best defined ; the three 

 branches of the trident could just be traced, but they were very iU-defined ; 

 the fan [>j] from No. 4 was plain, and the eastern portion (under the east 

 rim) very bright as compared with the other markings. The streak y was 

 well seen, though faint ; /3 could also be traced, but I was unable to see any 

 signs of spot No. 32 " [within or on it]. On the same evening, January 

 12, Mr. Pratt writes: — " Sector b seen badly luitJwut S.E. ray [?], and con- 

 nected as usual with streak c [agreeing in this respect with Mr. GledhQl's 

 seeings], which appeared connected with the north border near m [this con- 

 nexion is by Webb's elbow ?']. Trident observed, excepting the junction of 

 its arms ; its stem seen. Contour of floor very similar to sketch of 1869, 

 August 26." [On December 13, 1869, Mr. Gledhill's seeings were some- 

 what similar (see interval 48 to 60 hours, ante, p. 278).] 



1869, August 17.— See ante, p. 252. 



1869, November 14. — Mr. Gledhill recorded the sector as " fairly bright," 

 ^ and e as broad and bright, and extending beyond and through spots Nos. 

 5 and 14; ft faint, and a entirely east of spot No. 16, and from it a extends 

 to the east border. 



Summarij.— Sun's altitude 19° 2'-0 to 22° 31'-3 ; tint of floor 0-45, esti- 

 mated from curve. Streaks generally visible — sector, east and middle arm 

 of trident ; the others are not so frequent, but more of them are seen, and 

 they are mostly brighter than in the earlier intervals. 1870, July 7 and 8, 

 there appears to have been an absence of brightness in the N.W. part of the 

 floor. 



Interval 72 to 84 hours. 



1870, April 11. — Mr. Elger recorded that all the markings seen on the 

 10th inst. were reobserved with the addition of the west arm of the trident 

 (e) ; " " was very hazy and ill-defined, rj well seen. On the same evening 

 Mr. Gledhill recorded the floor as medium, =0-50. The north floor at the 



