OBSERVATIONS OF LUNAR OBJECTS. 



275 



parallel ■n'ith a line through spots Nos. 1 and 4, but falls a little at the east 

 end. Streak y seen extending from a little S. of the middle of II Yi'^'^, faint : 

 6 hours. Streak /3 seen running from spot No. 3 to the N. border. 



1869, December 12. — Mr. Elgor says, " I could make out a portion of the 

 sector, but it was exceedingly ill-defined ; the remaining part of the iloor 

 api^eared to be of a uniform tint." Mr. GJedhill recorded the floor as light, 

 = 0-33, and the sector faint, nearly as dark as the floor. The streak a seen 

 with difficulty ; the N.W. portion of the floor brightest. The, shadows of the 

 west border had edges on the east veri/ well defined, as if a narrow strip of 

 7ic/Jit fringed them ivitho^tt nehidosity. [This last remark appears to be in- 

 compatible with the idea of both spots and streaks being difficult of observa- 

 tion on account of the bad state of the earth's atmosphere ; for the same 

 observer, with the same instrument at the same time, describes the sector 

 and a as difficult, while the shadows are so well defined as to exhibit dif- 

 fraction fringes. Should the paucity of spots and streaks on this occasion 

 not have been dependent on our atmosphere, then we have a different state 

 of things to that which conduces to the apparition of spots when streaks are 

 faint, and vice versa.'] 



1870, October 3. — Mr. Elger recorded the sector as complete and faint, 

 but in strong contrast with the dark floor ; he remarks that it is unusual for 

 him to see the sector at so early a period of illumination. Mr. Gledhill 

 recorded the sector, with streaks a, /3, y, h, e, and ^, as seen. 



Summarif.—finn's altitude 7° 48''1 to ll°38'-2 ; tint of floor 0-39. Streaks 

 generally visible — sector, y, ft, a, and arms of trident; they are mostly faint, 

 but o was seen as a narrow bright streak on February 9, 1870. 



Interval 36 to 48 hours. 



1870, April 10. — In Mr. Elger's diagram of this date the connexion is 

 unmistakable of the sector 6 vrith spot No. 4, also the N.E. end of the 

 streak »j with the same spot. The connexion of streaks i^, e, and ft with 



Fig. 12. 



Plato, April 10, 1870.— T. G. E. Elger. 



spots Nos. 1, 14, and 3 respectively is also apparent. In his remarks Mr. 

 Elger says, " th#-east arm of the trident was traced through spot No. 5 to 



~ " He also says, " although faint, 



u2 



spot No. 1 ; it usually terminates near 5." 



