78 REPORT — 1871. 



Interval GO to 72 hours.' 



1870, July 8. Mr. Gledhill records Nos. 1 and 17 as brioht spots badly seen. 

 Mr. Elgcr records No. 5 as seen only by glimpses, but brighter than No. 1. 



18G9, August 17. Mr. Pratt inserted the positions of the spots observed 

 b}- him " by independent estimation," also " their relative positions with re- 

 spect to lif/Jit streahs " were very carefully determined as follows : — 



No. 

 1. On the dark surface near the junction of two streaks. 



3. In the middle of a light streak. 



4. In the middle of a light streak (sector) *. 



17. On the dark surface close to a light streak (W. edge of sector). 

 13 and 19. In the middle of a light streak. 

 14. Near the margin of a light streak. 



Interval 72 to 84 hours. 



1870, April 11. Mr. Elger records No. 5 nearly as bright as 17, which 

 he regarded as fainter than at last lunation ; 14 and IG were easy, 24 and 

 25 seen by glimpses. Mr. Gledhill records Nos. 1, 3, 30, and 17 as bright 

 circular disks. Mr. Pratt detected the six spots which he observed with 

 difficulty. 



1870, March 13. Mr. Gledhill writes : " Unless I am very much mistaken 

 indeed, 34 was an easy object, i. e. No. 1 came out easUy ' double ; ' also, as 

 the E end of the floor slopes to the east, spots Nos. G and 7 may be seldom 

 seen on this account (?)." To this I add : "This may be the case while the moon 

 is passing from perigee to apogee." Mr. Gledhill says further : " No 3 (and 

 30) very easy, wide, double ; 3 is the larger, both equally bright : 30 is not 

 seen nearly so often as 3 ; when only one is seen it is 3." 



1870, June 9. Mr. Elgcr recorded 5 as brighter than 17. 



1870, February 11, 6.30. Mr. Gledhill found spots Nos. 1 and 17 as very 

 sharp bright disks, but could not detect interior shadows ; he describes Nos. 

 1, 17, and 3 as sparkling. Of No. 1, he says, it often comes out double; 

 last year I often saw it thus. I am now almost sure I see a minute object 

 close to the west of it (34). 



Interval 84 to 96 hours. 



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

 middle and east arm of 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 

 crossing the last arm of the trident, terminates about halfway between the 

 latter and the west limit of the ' sector.' During the May and June luna- 

 tions, I had faint glimpses of it ; but it was then a very much more difficult 

 object than it is now." 



The apparition of this streak appears in some way to be connected with 

 spot No. 5, the variations in -v-isibility of which are considerable. As, from 

 the discussion of visibility, the connexion of these variations with illumi- 

 nating, visual or atmospheric (terrestrial), changes appears to be untenable, 

 it maybe suggested that, if the first maximum, Aug.-Sept. 1869, resulted 

 from increased activity, ejecta may have been thrown out and jiroduced the 

 faint streak which was seen on the west of No. 5 by ttuo observers. At or 

 about the second epoch of increased activity, a larger quantity of ejecta 



: * Mr. Gledhill has frequently observed spot No. 4 at the angle formed by the eon- 

 verging sides of the " sector." 



