278 KEPORT— 1866. 



IV A^ ' (X of Sec. I.). This does not appear to be the case from the photo- 

 graph. The whole of this portion of the map requires to be very carefully 

 examined under good atmospheric circumstances at the telescope. I have a 

 record 1864, July 24, of the valley 88, Sec. I. between the range above men- 

 tioned and a parallel one. 



52. Shown by Lohrmann, hut not at all cori-ectly. It is quite detached in 

 Sec. I. from the moimtain 20, on the south edge of which it is evidently 

 situated. 



56, 57. Lohrmann gives these mountains as one, which he describes as the 

 highest of the mountain-ranges near 28 of Sec. I. 



58. Lohrmann, Sec. I. p. 44, classes 25, 26, and 27 together as apparently 

 belonging to low luall-mountains ; 26 I have not found ; 27 I describe as an 

 ancient and partly filled crater (IV A^^^) with a slightly depressed surface; 

 and 25 is the depression IV A"'*' in the valley IV A^**^. 



59. Lohrmann shows at the extremity of the mountain-arm IVA^ » 

 which he extends further to the S.W., a craterlet ; this is probably IV A^ ^^. 



67, 82. Schmidt's crater-rills 354 and 355 are situated respectively upon 

 the S.W. edges of Lohrmann's two mountains 19 and 20, Sec. I., which 

 he places in the mountain-border of Albategnius. These mountains he 

 separates in the Hne with IV A^ '■"', IV A^ 9', and IV A^ ^^. IV A^ *^, which 

 he places on the south part of his mountain 19, is a little too far east as com- 

 pared with mine ; and IV A^ ^^, which he places incorrectly with regard to 

 IVA^'*2 (inasmuch as it is on the S.W. of TV A^'^% he throws a little 

 too far to the east of the line IV A^ ^0^ IV A^ ^' , IV A^ ^2 ^ jg ^j^^, grater 

 IV A^**^ which separates the riUs, and Lohrmann shows it with IV A^''* 

 lower than the mountain-border and on the floor of Albategnius. There is 

 no point of upburst indicated by Lohrmann such as is evident on the photo- 

 graph. 



78. Given by Lohrmann opening into a plain at a higher level than the 



floor of Ptolemseus. On this plain Lohrmann places IV A^ '^^. This plain 

 is entirely wanting in the photograph. 1866, Sept. 17, 8'' to 10'', I recorded 

 the appearance of a plateau between IV A^'^^ and IV A^"^, intermediate in 

 level between the high N.E. border of Albategnius and the low floor of 

 Ptolemaeus, which I afterwards found was the summit of the mountain 

 IV A^^^, and between it and the mountain IV A^*^^ was the deep hollow 

 IV A^^^, seen very distinctly on the 19th of Sept. 1866. I have not met 

 with Lohrmann's plain. The deep hoUow IV A^ ^^ is entirely wanting in 

 Sec. I., in which the plain occupies the position of IV A^ ^^. 



84. Lohrmann shows this valley as hlocTced by a portion of the border of 

 Ptolemseus between his 16, Sec. I., and the plain west of Ptolemaeus, i. e. "be- 

 tweenIVA^l'^andIVA?23. 



The following objects, some very imperfectly, are found in Lohrmann, Sec. 

 I., 10, 17, 26, 29, S3, 87. 



The following objects do not occur in Lohrmann, 30, 54, 79, 86, 88, 89. 



Addenda to Catalogue. 



86. A craterlet north of IV A« * ; estimated 2"-0 mag. 0-12. 

 First seen 1867, April 11, -with the Eoyal Society's achromatic 4|-inch 

 aperture, power 230. It is not in E. & M., nor in Lohrmann. 



