OBSERVATIONS OF LUNAR OBJECTS. 271 



li li 



loG to 1G8, 18G9, Oct. 19. Shown by Mr. Gledliill as a long- narrow streak ; Mr. 



Pratt mentious a portion of the floor near the moun- 

 tain " m " on the north of the streak as very dark. 

 1C8 „ mer., „ Sept. 20. Continued in " o." (See fig. 8, p. 263.) 



1870, April 15. Very bright, the projecting portion of c brighter than 

 on the 14th (interval 132 to 144 hours), and neaily 

 joining the western arm of the trident; the conti- 

 nuation " o " not seen. 

 „ Aug. 11. Shown as very narrow by Mr. Elger (see fig. 18, p. 289), 

 and quite separated from the border, the west end 

 crossed by c and i ; no " o." 

 „ Oct. 9. Shown as narrow by Mr. Elger (see fig. 19, p. 289), and 

 quite separated from the north border, the west end 

 crossed by i and c, which together form a curved streak 

 concave towards the west border, the continuation 

 " o " being entirely absent. 



These observations (interval 1C8 hours to meri- 

 dian passage) are quite sufficient to show that the 

 change that supervened between the 20tli of Sep- 

 tember, 1869, and the l-5tli of April, 1870, is in- 

 dependent of illuminating angle and its variations, 

 the new disposition seen in April of the streaks on 

 the N.W. part of the floor continuing to October 9, 

 1870, at this period of the luni-solar day. 

 mer. „ 168, „ Mar. 17. Recorded by Mr. Gledhill as easy, and with the sector 



as the hriyhtest on the floor. 

 1C8 „ 156, 1869, Nov. 19. Continued in streak "o," with c reaching nearly to 8; 



convex to west border. This is greatly in contrast 

 with the observations of October 9, 1870 (see in- 

 terval 168 hours to meridian). 

 „ Dec. 19. Eecorded as bright. 



1870, April 10. Bright and sharp; projection c has disappeared. 



1871, Jan. 7. No mention of a; the N.W. part of the floor in the 



same state as in August 1869 (see figs. 5, 6, and 7). 



1.'>G „ 144, 1809, Oct. 21. Brighter than on the 19th of October, 1809 (see in- 

 terval 156 to 168 hours). 

 1870, July 14. Condensed brightness in the middle. 



144 „ 132, 1869, Dec. 20. Recorded as bright, and extending from Webb's elbow. 



1870, April 17. Recorded by Gledhill ; query "o." (See note in the 



chronological arrangement.) 

 ,, Aug. 1.3. Seenby Gledhill; a dark tint of floor recorded by Pratt. 



1871, Jan. 8. Recorded by Gledhill as sharply defined, bright, nar- 



row, and straight. 

 l.'^<2 „ 120, 1870, Mar. 19. Very bright, with the sector the hrir/hfcst on the floor, 

 120 „ 108, 1869, Dec. 21. Recorded as the hrirjhtest. 

 108 „ 96, 1870, July 16. Condensed central portion. 

 96 „ 84, 18C9, Dec. 22. Recorded as brightest. 



84 „ 72 No observation. 



72 „ CO, 1869, Sept. 25. Mr. Gledhill observed « o," also the curvilinear streak 



from spot No. 13 to the sector. 

 CO „ 48, „ Oct. 25. Dark space between the streak and border. 

 48 „ 36, „ Dec. 24. Uru/Iiter than any other streak. 



1870, Aug. 17. Eecorded by Gledhill as the brightest amongst the 

 faint streaks observed, 

 86 „ 24, 18C9, Oct. 26. Seen by Gledhill. 



1870, Mar. 23. Difl'use and extending up to the north border, easily 

 but not well seen. 

 24 „ 12, 1869, Sept, 27. a not seen, c described as a broad band of brightness, 



width about one third the distance from spot No. 1 

 to the border. 

 12 „ 0, „ Oct. 27. Seen by Mr. Gledhill. 



