^^ • REPORT 1866. 



*37. A mountain appearing as a bright spot jnst N.E. of IV A^ 2^, 

 length N.N.W.-S.S.E. 11"-41. Well shown by Lohrmann. 



38. A cliff (apparently) on the high land crossing Hipparchus. It is on 

 a " ray from Tycho." Not in Lohrmann. 



39. A bright spot S.S.W. of IV A" ^ See IV A« ^7. 



40. An isolated craterlet between IV A^^" and IVA^^a s^.qq^ 



mag. 0-22. 



41. A crater just S.E. of IV A^ ^3^ gr/.g^ j^^g. 0-41. 



This crater, of nearly the same superficial extent as IV A^**^, which adjoins 

 it on the south-east, differs from IV A^ ^^ in an important particular ; 

 IV A^^^ has a narrow border, and appears to be deejjer than IV A^^^, which 

 is a shallower pit in a broad border, a class of crater of rather common occur- 

 rence on the moon's surface. The magnitude of IV A^^^, 0-42, includes the 

 broad border. IV A^ ^^ is remarkable for its apparent priority to the crater- 

 riU IV A^ '^'^, which cuts completely through it, rendering the north part 

 brilliantly white, while the smface tint of the south part is dark. It would 

 appear that the north part of IV A^ "^^ has been raised, the crater-riU IV A^ ''^ 

 occupying the very summit of the waU of Albategnius (see IV A^**^), from 

 which the south slope is very steep. The crater is shown by Lohrmann. 



42. A craterlet a Uttle N.N.W. of IV A^^'' 3"-80, mag. 0-25; situated 



on the W.S.W. slope of the cliffs crossing Hipparchus. 

 *43. A craterlet between IV A^^'' and IV A^* 4"-76, mag. 0-29. 



44. A craterlet W.S.W. of IV A? 6 3"-33, mag. 0-23; situated on the 



W.S.W. slope of the cliffs crossing Hipparchus. 



45. A craterlet X.W. of IV A^*^ ^i,.>jq^ ^^„_ o-29. 



46. A craterlet N.N.E. of IV A^'^^, estimated 3"-20, mag. 0-19. 



**47. The west mountainous border of IV A^^'^, length N". by W.-S. by E. 

 18"'07. WeU shown by Lohrmann. 

 48. A short mountaiu-range between IV A^^ and IV A^^, length 

 N. by W.-S. by E. 14"-74. Shown by Lohrmann. 



*49. A craterlet on the south extremity of IV A^ *' 3"-33, mag. 

 0-25. It is situated on the east side of the end of the mountain- 

 arm, and is the c of B. & M., but not shown by Lohrmann. 



50. A crater on the north of Albategnius, between IV A^^* and 



IV A? 'ti, 5"-23, mag. 0-32. Shown by Loluinann. 

 This is the middle one of the thi'ee craters which make up the pear-shaped 

 depression as seen under some aspects on the north of Albategnius. See 

 IV A^^*. It is not difficult with a suitable apertui'e and power. 



51. A crater between IV A^ '" and IV A^ 34_ 5r-.23, mag. 0-33. 

 *52. A crater east of IV A^ ^^ adjoining it. 7"-13, mag. 0-42. 



53. A crater-form depression between IV A^^*^ and IV A^*'. 



54. An elongated depression between IV A^^ and IV A^^**; length 



S.S.W.-N.N.E. 8"-56, breadth uncertain, under 5". 

 This depression occiu-s in the high land which fills the angle between 

 Ptolemajus and Albategnius, and is S.E. of IV A^ ^^ J the direction — 



IST.N.E. -S.S.W. (somewhat inclining east and west) of IV A^ ^^ — is similar to 

 that of numerous rents and fissures in this and other parts of the moon, and 



