ON MAPPING THE SURFACE OF THE MOON. 



271 



D'recliion. 



Character. 



Objects and Remarks. 



N.W.-S.E., 



1. Upheaval and 

 depreasioii. 



N.W.-S.E. . . , 



N.N.W.-S.S.E. 



N.N.W.-S.S.E. . 



N.WW.-S.byE, 



2, Upheaval and 

 depression. 



1. Upheaval ? . . . 



S.-N. 



2. Upheaval . . . 



1. Depres.sion . . . 



1. Upheaval and 

 depression. 



IV A? 6 (see Table, p. 273) on the opposite 

 part of liipparchus, and separates the higher 

 level of Hipparchus from the lower level of 

 IV A'" ^ If the two W.N.W.-E.S.E. 

 rangc_ in IV A" and IV A^ were contempo- 

 raneous in their origin, either the higher 

 level of Hipparchus has been comparatively 

 undisturbed, or the irregularities between 

 the two lines of disturbance have been over- 

 spread subsequent to their formation ; the 

 apparently ancient crater which now ap- 

 pears as a wreath of disjoined mountains in 

 rV A^ '® is significant in this respect. 



^^^A«^ n^ A"'", iv a-^^ iv a''^ 



IV A« 16, IV A» «^ IV A"^ 6^ IV A"^ *^ 

 IVA»*9, IVA»^7. 



This line forms part of a very extensive 

 range of cliffs, which can be traced from 

 the east border of Ptolemceus past the con- 

 spicuous crater Herschel I across the area 

 IV A", N. W. of the N.E. point of the bor- 

 der of Rhaeticus, probably as far as the cra- 

 ter Menelaus, on the south border of the 

 Mare Serenitatis. With the exception of 

 the small portion forming the N.E. border 

 of Ptolemajus which faces the S,W., the 

 faces of the cliffs are directed towards the 

 N.E. In the N.W. part the range is parallel 

 with a portion of the Apennines. 



In area TVA"^ this line with W.N.W.- 

 E.S.E. No. 2, and S. by W.-N. by E. No. 4 in- 

 close a triangular space more or less disturbed 

 in which the crater IV A" ^ is prominent. 

 IV A^'^ IV A"3i, WAa?, l\Ai^9 ^ through 



the N.W. border of Ptolemseus to the 



crater on its floor. 

 IV A" 6^ IVA<^69^ IV A" 70. 



This short line prolonged across Reaumur 

 intersectsW.N.W.-E.S.E.No.2,andN.W.- 

 S.E. No. l,near rV A" =1 The crater in Ptole- 

 masus is in the continuation of this line. 

 IVA."'9,IVA'^64^IVA°'66^ 



This line is directed towards the west 

 border of Thebit, and the east border of 

 Purbach. 

 IV A- 32^ IVA'^io, IV A-^^s^ RhiBticus. 



This line ot considerable depression lies be- 

 tween the two faults W A'' *^ and IV A''*^. 

 IVA^9», IVA^si, IVAf92^ IV A^^ and 



IVAffii. 



A line principally of depression (craters). 

 There is quite a knot of craters east of 

 IV A^32^ forming apparently a second point 

 of upburst on the " Ray from Tycho,' the 



