OBSERVATIONS OF LUNAR OBJECTS. 



285 



1869, ISTovembcr 16.— Mr. Gledhill recorded the floor as very bright, 

 =0-10 ; he says : " I never saw the floor so bright ; streaks very bright in- 

 deed, definite and easy. I have drawn them as I saw them. That drawn 

 through No. 5 does not quite reach spot No. 1. Streaks d and 6 [the 

 bifurcation of e] meet halfway between the extremity of 2 (which originates 

 at the foot of the inner slope in a bright elevation on the floor close to 

 the foot, probably B. and M.'s mountain-peak ^) and spot No. 1." 



1869, October 17.— Mr. Gledhill recorded the floor " as dark as the south 

 part of the Mare Serenitatis (?), registered as medium, =0-50." He also re- 

 corded a weU-seen streak which covered spots Nos. 13, 19, and IG, parallel 

 to the streak /3, which, if produced to E.N.E., would cut the north border of 

 crater A outside Plato. The western portion is designated " o," the eastern a. 



Summary.— ^uns altitude 31° 42'-7 to 34° ll'-5 ; tint of floor 0-57, esti- 

 mated from curve. Streaks generally visible— the sector and N.E. streaks; 

 arms of trident not so frequently seen. The streaks were mostly bright, and 

 especially so on November 16, 1869. 



Interval 120 to 132 hours. 



1871 , March 4.— Messrs. GledhiU and Neison record the floor as dark, 



=0-66 ' Mr. Neison speaks of the N.W. and S.E. portions of the floor as 



indistinct from broken light and streaks (see Eeport British Association, 



1871, p. 81) ; and Mr. GledhiU speaks of the arms of the trident being very 



broad and dift'use. , ^, ^, 



1870, June 11. — Mr. Elger could only see the sector and the three arms 



of the trident, aU faint. The same evening Mr. Gledhill recorded the floor 



dark,=0-66; streaks bright. , „ „ ^ ^^ 



SummMry.-Sun's altitude 34° ll'-5 to 36° 17'-5 ; tint of floor 0-60. 



Streaks generally visible— sector, arms of trident, and N.E. streaks except »;. 



Interval 132 to 144 hom-s. 

 1870, April 14. — Mr. Elger described the streak /3 as very plain and 

 bright, brighter than y. The middle, e, the brightest portion of the trident ; 



Fig. 15. 



Plato, 1870, April 14.— T. G. E. Elger. 



ri plain, brightest near the border, directed from the border towards spot 

 Wo. 4 ; diminishing in breadth as it approached No. 4, it could be traced 



