253 REPORT — 186fi, 



23. A craterlct S.E. of IV A* 22 2"-85, mag. 0-18. 



IV A* '^, IV A* 22^ an(j ly }^«. 23 fQj,jji ^ short crater-row ; length 12"-4, 

 which with IV A* ^4^ jy ^a. 26^ a,nd the mountains extending towards Ileau- 

 mur, form an interesting group between IV A*" ^ and its surroundings, and 

 IV A* *. It is, however, not nearly so consjucuous as the group IV A^ l. 



24. A somewhat shallow crater opening into the valley IV A* ^9, n jg 



in the line of disturbance IV A'=' 5— IV A« ". 6"-66, mag. 0-39. 



This line is very exactly in the prolongation of VIIT. S.S.W. of IV A^, but 

 separated from it by the comparatively smooth floor of Hipparchus, which 

 extends here over a wide space. 



25. A short mountain -range east of IV A* ^4 and IV A* ^^ ; length of 

 crest ll"-0. It appears to take its rise at the east edge of IV A«* 24^ 

 and nearly fills the angle of IV A" -^. 



26. A craterlet W.N.W. of IV A« 24^ 3".i^ mag. 0-18, shown by B. «S:M. 

 but misplaced. Shown much larger by Lohrmann ? 



27. A short mountain-range, crest somewhat sinuous, extending from 

 IV A* 24 and IV A* 26 towards IV A* ^^ j ie„gth of crest ll"-4. 



28. A short moxmtain-range west of IV A* "^ and IV A** 26^ direction 

 S.S.W., length of crest 8"-5G, breadth of base 6"-18. The W.N.AV. 

 slope appears to be more gentle than the opposite, and the crest is 

 rounded. The north end of this mountain-range appears to bo 

 B. & M.'s y, and Lohrmann's Sec. I. 33. 



29. The vaUey between IV A* 25 r^^^^ jy ^« 27^ apparently communicat- 

 ing with IV A* 24. Shown by Lohi'mann. 



30. A mountain between the depressions IV A" ^2 and IV A'* ^^. 



31. A mountain at the S.W. end of IV A* 20. its west slope is pro- 

 minent. Shown by Lohrmann, Sec. I. near 32 and 33. 



32. A short valley S.S.E. of IV A« !«, length 14"-74, breadth 5"-23. 

 This valley is very exactly in the line of the similar valley IV A"? ^ ^ which 



pierces the line of cliffs IV A" '^, forming the south -Avest border of Hippar- 

 chus. The surface of Hipparchus from IV A" ^^ to the cliff IV A* ^^, on which 

 IV A* 22 is situated, appears to be smooth. The direction of the line joining 

 the valleys (S.S.W.) is sensibly parallel with the lines VIII. S.S.W., IX. S.S.W. 

 Area IV A^. The S.S.W. mouth of IVA^'^s ig blocked by the summit of 

 the cliff IV A* 32 coincident with the " Eay from Tycho." 



33. The northern part of the cliff IV A ^ 38, 



The cliff, or rather the gently rising or swelling ground of which IV A^ 38 

 is the southern extremity, extends lengthwise from the north of IVA^25^ 

 where it is broadest, to the west of IV A''^^, where it merges into the cUff 

 IV A* ^*. The west foot is well marked as it crosses Hipparchus. 



34. The east part of the interior slope of Horrox, IV AP ^^. 



35. A small hillock on the east of Horrox, 2"-38, mag. 0-16. 



ly A? 100^ IV A** ^^, and IV A* 35 arc upon the foot of the rising ground 

 IV A^ 38^ ly A.« 33_ A faint ray connects IV A* 35 ^ith the mountain at the 

 extremity of IV A* 32 in the direction of the dotted line. 



