32 REPORT—1868. 
of W. arm 4’-47, of E. arm 5°78, opening between the arms 8-02. Not 
shown by B. & M. but by Lohrmann. 
This semicrater appears to have been modified by the “fault” TV Af ®*!, 
by which a kind of buttress has been thrown up in the interior against the 
N.W. rim. It has a craterlet, [V A? %, on the S. end of the buttress. 
54, The S.W. end of the mountain-range I Af *5(?), forming the W. 
mountain-border of IV Af *. 
On Rutherford’s photogram, ITV Af !! and TV A® 4 are enclosed by moun- 
tains, of which IV A** is on the E. and TV A 4 on the W. TY Af = is 
clearly Lohrmann’s 62, Sec. I. The mountain in area I Af forming the N. 
edge of TV A 49, most probably is Lohrmann’s 64, Sec. I., although it does 
not oceupy the position which Lohrmann assigns it. TV A®®4 occupies the 
position of the N. end of Lohrmann’s 63, Sec. I. Lohrmann appears to be in 
error here, inasmu chas he makes the chain 63, Sec. I., continuous from a point 
S. of the latitude of IV Af 3 (60, Sec. I.) to a point a little N. of the latitude 
of the N. edge of J, Sec. J. On the photogram IV Af! and IV Af 4 are 
disconnected, IV A occupying the position of the 8. end of 63, Sec. I., and 
TV A®54, as before mentioned, the N. end. The valley IV Af * passes between 
them. See ante, p. 18, IV AP 1°. 
The direction of Lohrmann’s chain is also greatly in error; he makes it 
align with E and B of Sec. I. (IV A*19, and Hind). The true alignment is 
yery different, viz. the line of fault IV A® ®. 
55. A low mountain running E, and W.; length of crest 10':26, breadth 
of base 4°48, 
This mountain is situated between IV A? #4 and IV Af1!; its base approaches 
in form toa parallelogram, the crest forming the diagonal. 
56. A small hillock on the line of fault [TY A®®!, between IV Af and 
TV Af 58; it is close to the 8.E. foot of TV Af", 
57. A low mountain N.N.E. of the depression IV A* ; length of crest 
6''-71, breadth of base 7°18. 1867, Dec. 3, 10", with the Royal Astrono- 
mical Society’s Sheepshanks telescope, No. 5, aperture 2-75 inches, power 
100, I identified TV Af 47, IV AP 4, and I A®*8 as Lohrmann’s 63, See. I. 
T also proved the inaccuracy of Lohrmann in continuing the chain to TV Af), 
See IV AF 54, 
58. A low mountain between IV Af! and IV Af*®; length of crest 7°18, . 
breadth of base 7-18. Thethree mountains [TV A? >, TV Af 7,and TV Af 45 
mark an area of subordinate elevation between the faults TV A*# and 
TY Af 51, 
59. A shallow depression on the W. slope of [TV A® 11, N. of TV A#°. 
60. A craterlet on the E. slope of IV A*!° between the crest and the fault 
TV Af 42, It is situated on the higher land W. of the “ fault,” and is in this 
respect somewhat similar to the craters TV Af 15, TY Af21, and TV AP ®; 
2-7, mag. 0-16, the fourteenth in order upon IV A*, 
61. The ridge crossing IV Af! from §. to N. 
This ridge was discovered on Dec. 3, 10%, 1867, with the Royal Astrono- 
mical Society’s Sheepshanks telescope, No. 5, aperture 2°75 inches, power 
100. The observation is thus recorded :—<IV A**7 and TV Af 29 TV AP 5 
form the W. and E. boundaries of Lohrmann’s plain J, Sec. I., containing 
the two low mountain-chains and central mountain. The two low mountain- 
chains I neither identify on the moon nor on the photogram; but I see on 
the moon a mountain between them [ITV A* *7 and IV A8*9 TV AF), which 
is not the central mountain of J, See. I., but the mountain-ridge between the 
two, i.e. LV A® 57 and TV A#*9 TV AF, IT apprehend the mountain-ridge 
