280 REPORT— 1872. 



foot of the north border was brightest, especially at the N.W. ; all streaks 

 rather faint, especially the sector. Mr. Pratt speaks of " cloud " in the N-W. 

 and S.W., where a ray from Anaxagoras appears to cross the floor, inter- 

 fering with the trident, of which the arm east of spot No. 1 {'C) and the west 

 arm (e) were much obscured. 



1871, March 2. — Mr. Elger records the markings as mostly faint. "Webb's 

 elbow and the streak a extending from spot No. 19 to spots 20 and 21 very 

 distinct. The new marking, p (Mr. Pratt's), west of No. 5, faint but trace'- 

 able. 



1870, March 13.— Mr. Elger described the markings as faint and ill- 

 defiued ; they were the same as seen on January 12, 1870. Mr. Gledhill 

 recorded the floor as " medium or light, like Mare Frigoris," registered =0-42. 

 "Webb's elbow was well seen near the foot of the inner N.W. border. 



1870, June 9. — Mr. Elger recorded the markings as faint and difficult to 

 trace. The streak a on the N."W. part of the floor had the same nebulous 

 appearance that it had on May 10. [Mr. Elger does not appear to have 

 noticed a brightness of the N."W. part of the floor equal to that observed on 

 May 9.] 



1870, February 11. — Mr. Elger writes: — "All the markings shown on 

 tracing No. II. (1870, January 14) were seen, but they were very taint. 

 The three branches of the trident could just be traced." On the same evening 

 Mr. Gledhill says : — " Streaks a, /i, y, I, e, i; are well seen, as also the sector. 

 I see a faint streak yu just above the west end of a and parallel with it ; this 

 streak, if produced eastwardly, would pass just north of spot No. 3 (see 

 fig. 16, 2^ost, p. 286). The streak \ is seen easily, it is the faintest ; streak 

 /3 extends a little to the west of spot No. 3. There is a strong brush of 

 light from the border just north of II E '/'2, from which a faint streak runs up 

 to spot No. 4." [Is this Mr. Pratt's 12 its direction agrees, but its locality 

 is rather too far to the north. See interval 48 to 60 hours, 1870, March 12, 

 ante, p. 278.] 



1869, December 14. — Mr. Elger recorded a and its continuation " o" as the 

 brightest and best defined on the floor, and he shows Webb's elbow in con- 

 tact with the N."W. border. Mr. Gledhill mentioned the bright floor con- 

 necting n and ri, but without a distinct streak ; he recorded the floor as 

 light, = 0-33, and all the streaks as well seen, jj the faintest, and the extension 

 of the sector to spot No. 3 not easy. Mr. Elger says : — " The sector I noted 

 as faint and difficult to trace ; the middle prong of the trident appeared to be 

 the brightest on the S.W. side of the floor ; it could be traced as far as spot 

 No. 14." Mr. Pratt noticed the trident shaded off round spot No. 1, the 

 sector nearly divided between spots Nos. 3 and 4, and y in contact with the 

 sector. 



Suminary.—Snn'a altitude 22° 31'-3 to 25° 49'-5 ; tint of floor 0-49, esti- 

 mated from curve. Streaks generally visible — sector, trident, and the N.E. 

 streaks a, ft, r], and y mostly faint; \ and f.i were observed on February 11, 

 1870 ; and o, with its continuation " o," was recorded as the brightest and 

 best defined on the floor on December 14,1869. 



Interval 84 to 96 hours. 



1870, March 13. — See interval 72 to 84 hours, see above. 



1870, December 4. — Mr. Elger writes : — " The marking connecting the 

 middle and east arms of the trident, which was, I believe, first seen by Mr. 

 Pratt last spring, I found a very easy object, fully as bright as the brightest 

 portions of the trident ; it follows the curvature of the south border, and, 



