296 REPORT— 1872. 



floor, c and k being much fainter and the western part of c obliterated, even 

 in the larger aperture of the Halifax refractor, as compared with the seeings 

 and drawings of Mr. Pratt in August 1869 ; the change consisted in the 

 fading of k and c and the intensification of a and " o." 



For Mr. Gledhill's drawing see ante, p. 263. 



1870, October 14. — Messrs. Gledhill and Pratt both recorded the floor as 

 medium, =0-50. Mr. Pratt remarked that the streaks were difficult, con- 

 sidering the number of spots that were visible. 



Summary.— SvLn's altitude 22° 31' -3 to 19° 2'-0 ; tint of floor 0-49 to 

 0'45. Streak generally visible, the sector. 



Interval 60 to 48 houi-s. 



1869, August 27.— See ante, p. 254. 



1869, October 25.— Mr. Gledhill recorded the floor as light, =0-33, the 

 sector as " very faint, and differing but little in brightness from the floor to 

 the east of it ; its base was bounded by three craters, Nos. 26, 27, and 28, 

 on the inner slope of Plato ; its apex extended beyond spot No 4, and it cut 

 streak /3 a little east of spot No. 3 : " the streak y is described as bright, sharp, 

 and narrow. 



/Sfiewmary.— Sun's altitude 19° 2'-0 to 15°23'-3; tint of floor 0-45 to 

 0*42 ; the streak /3 most frequent. 



Interval 48 to 36 hours. 



1869, December 24.— Mr. Gledhill recorded the floor as light, =0-33 ; the 

 sector as large and diff'use, scarcely brighter than the adjacent floor ; outline 

 not sharp. The streaks B, e, ^ about as faint as the sector; /3, rj, and y not 

 fairly seen ; aU are faint. All along the north border of the pointed shadow 

 from B. & M.'s ^ Mr. Gledhill saw a fringe of light (see Interval 24 to 36 

 hours, 1869, Dec. 12, ante, p. 275 ; also quotation, Elger's Observation 1871, 

 Nov. 20, 2^ost, p. 299), ?'. e. the floor adjacent to the north edge of this shadow 

 was quite bright up to the foot of the border of Plato, a appeared brighter 

 than any other streak. 



1870, August 17. — Mr. Gledhill recorded the floor as rather bright, regis- 

 tered at 0*40 : streaks faint ; a was the brightest, but it was neither dense 

 nor broad, nor could it be said to be really bright ; the others were fainter 

 than it. The sector had ill-defined edges. 



Summary.— 8nn's altitude 15° 23'-3 to 11° 38'-2 ; tint of floor 0-42 to 0-39. 

 Streaks generally visible — sector and eastern arm of trident, others not so 

 frequent ; all recorded as faint. 



Interval 36 to 24 hours. 



1870, March 23. — Mr. Gledhill recorded the floor as medium, =0-50. He 

 described the sector and o as easily, but not well, seen ; o was diffuse, and ex- 

 tended up to the north border [in December the brightness near the border 

 subsided after interval 60 to 72 hours, see ante, p. 268] : ^, e, ^ seen with some 

 difficulty ; they were much fainter than a and the sector. The shadow of B. 

 and M.'s f was on the floor, and the adjacent floor to the N.W. was very 

 bright, much brighter than a or the sector. The bright space was directed 

 to spot No. 4, and it extended one third of the distance from the border to 

 No. 4. Mr. Gledhill could not determine its shape ; but it appeared to him as 

 an intensified form of the streak rj, and was the most striking object on the floor. 



1870, July 19.— Mr. Gledhill recorded the floor as bright, ==0-33. The 

 streaks but little brighter than the floor ; none were striking objects. 



1869, August 28.— See ante, p. 2-54. 



