ON MAPPING THlil SURFACE OF THE MOON. 251 



in every direction, and that the depressions east and west present 

 the characteristics of valleys in the line of cliffs on the south border 

 of IV A* 1 ^, The eminence on the west is the east side of the val- 

 ley IV A* 32. The approximate measures of IV A** ^^ are, length 

 S.S.W.-N.N.E., 12"-0, breadth 9"-0. 



13. A bay in the south border of I V A* ^ l between IV A* ^ 2 and 

 IV A* 28. 



14. A cliff or mountain-peak south of IV A** ^0. Shown by Lohrmann. 

 From this cliff there are three divergent lines, one slightly west of south 



to IVA^58. ti^ig (rVA«49) forms the west foot of the cliff, IVA^^s, 

 IV A* 23, IV A* ^ ** ; one nearly due south, but sHghtly inclined to east, this 

 forms the summit of the cliff IV A^ 38^ which is furrowed by IV A^ ^^. The 

 third passes thi-ough the mountain IV A ^ 37^ and in the south part of its 

 course is coincident with the east edge of the shallotv and sinuous continua- 

 tion of the vaUey IV A^ ^^. 



IYA«i4, iyA'«32^IVA'*l2^ IVA«30, IVA«1^ and IVA«28 exhibit 

 a well-marked and characteristic line of cliffs south of the crater IV A* ^ ; a 

 depression IVA«20^ not unlike IVA«*12 and IV A« ^ 3^ connects IV A* ^ 

 with this line, to which, with the mountains around, IV A* ^, stands somewhat 

 in the relation of a centre. 



15. A short mountain-range extending S.E. from the S.E. border of 

 Rhfeticus. IV A* ^ and IV A^ ^^ with III A? ^^, the crater on the 

 floor of PtoleniEeus, are in the continuation of this line. 



1 6. A mountain-peak on the west border of Reaumur. Length of crest 

 7"-13 ; probably B. & M.'s /3. N'ot well shown by Lohrmann. 



17. A bright spot S.S.W. of IV A"* T, the north part. 5"-94, mag. 0-37 ; 

 probably a crater in the east boundary of Hipparchus. Sec IV A^ 39. 



*18. A craterlet S.E. of Horrox. 2"-85, mag. 0-18. 



19. A mountain-peak on the N.W. border of Reaumur. Length 7"-13. 

 lY^aie and IV A**^^ are in continuation with a slight break. IV A* ^ 



and IV A* ^^ are quite detached. None are shown well by Lohrmann. 



20. A depression between IV A* "* and IV A* ^3^ and also IV A* 28. 

 Direction S.S.W. , length 12"-36, breadth 6"-66. Two rays proceed 



from the E.S.E. side ; the S.S.W. ray extends as far as IVA'*27^ and the 

 N.N.E. ray nearly as far as IV A* 21. The depression consists of two parts, 

 one to the S.S.W., the other to the IST.K.E., not very unlike two craters that 

 had coalesced. This, however, is hardly likely to have been the nature of 

 their origin, for they rather appear to be Jiolhws in the E.S.E. side of the 

 chain of low mountains or cliffs running towards Hipparchus. Two summits 

 in this chain are discernible, IV A* 30 at the W.N.W. end of the depression, 

 IV A* ^3 and IV A«3l forming the S.W. part of IV A« 20. ^ somewhat 

 similar formation, IV A^ ^4, but rather smaller, occurs near and to the south 

 of the group IV A^ ^ ; both IV A* 20 and IV A^ ^"^ have the same direction. 



21. A mountain S.W. of IV A'* ^ with a spur running between IV A" ^^ 

 and IV A** 27. HI figured by Lohrmann. 



22. A craterlet E.S.E. of IV A* ' 3"-6, mag. 0-21. Not in Lohrmann. 



