ON MAPPING THE SURFACE OF THE MOON. 89 
It is of a curved form; the S.W. end bisects a line drawn from the §. end of 
IV A“ to the W. side of IV A“4. 
TV A“ 9, TY A% 100, and IV A*!°! were first seen by Mr. Walker ; they are 
all on Rutherford’s photogram, 1865, March 6. 
102. A depression of a semicircular form on the mountain-range forming 
the east border of Hipparchus, the northern part. It is in this depression 
that the crater IV A*17 IV A$*9 is situated (see IV AS 1°, post, p. 40). 
103. A short spur on the 8.W. side of IV A*, near IV A**. 
This spur is not numbered on the map. It was recognized by Mr. G. J. 
Walker of Teignmouth, who thus mentions it under date of March 30, 1868 : 
—‘«The space numbered 15 in the map was dark, whilst the two ridges 40 
and the nearer shorter one appeared. In the middle of 15 [Query, the spur 
next to Rhieticus, see 105] there was a spot of light indicating a lower ridge.” 
104, An oval space (Mr. Walker queries it as a crater), not numbered in 
the map, but shown lying in the angle between the lines of fault TY A*” 
and IV A*49 on the 8.W. of Rheeticus. 
105. A short spur on the S.W. side of IV A*}, close to the 8. end of 
Rheeticus (see note on 103). 
106. The west wall of Rheeticus. 
Additions to Area IV AB. 
TV Af 100. A craterlet on the S.E. boundary of Lohrmann’s 58, See. L., 
Siw: of TY AP, 
101. A craterlet on the S.E. boundary of Lohrmann’s 58, Sec. I., 8.W. of 
iByea F200, 
' These craterlets were seen with the Crossley equatorial, 7-3 inches aper- 
ture, power 122, on May 28, 9.15 to 10.30. They were seen by glimpses 
only, the atmosphere being hazy and somewhat unsteady. 
102. A craterlet? 8. of IV A® 3, seen as a white spot with the Crossley 
equatorial, 7-3 inches aperture, power 122, on May 1, 1868, and probably seen 
as a craterlet with the Royal Astronomical Society’s Sheepshanks telescope 
No. 5, power 100, on May 30, 1868. 
_ 103. The north part of the formation between the faults TV A” * IV A#®, 
—IV A” TV A820 TV A* TV A"3 IV AB &, . 
104. The gorge between LV A**9 and IV Af 4. 
105. The mountain-crest between IV A¥ # and IV Af >, 
Additions to Area IV AS. 
TV Af 115. A depression or crater N. of IV AS and IV As; estimated 
diameter 2"-0, mag. 0°12. 
~ It is recorded as sketched on map 1867, April 11, and was afterwards seen 
1867, May 11, with the Royal Society’s 43-inch achromatic, power 230. It 
is shown by B. & M. 
The Rey. W. O. Williams ascertained in October 1867 that the mountain- 
- range LY A$ 48 presented the form of a stem with two branches in the form 
of a “ fork.” Restricting the designation IV A¢ 48 to the northern part or 
stem, we have :— 
116. The east branch of IV A‘ 48 from the fork. 
117. The west branch of IV As 48 from the fork. 
118. The valley between TV AS 26 and IV As 127, 
These objects were discovered independently by the Rey. W. 0. Williams 
and Herbert Ingall, Esq., on October 18, 1867. 
' 119. The depressed surface between IV A$} and IY A¢ 6, with which the 
valley LY As ® communicates. 
