274 



REPORT 1866. 



Direction. 



Character. 



Objects and Remarks. 



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



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



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

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

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



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



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



7. Upheaval 



1. Eill. 



I.Valley ... 



2. Upheaval . , 



3. Depression . 



4. Depression on 

 a line of up- 

 heaval 



5. Upheaval . 



N. by W.-S. by E. 1. Upheaval . . , 



N. by W.-S. by E. 2. Upheaval . . , 

 N. by W.-S. by E. 3. Upheaval . . , 



These six lines traverse a nearly rectangu- 

 lar area,boundedontheS.S.W. by W.N.W.- 

 E.S.E. No. 1, on the N.N.E. by W.N.W.- 

 E.S.E. No. 6, on the W.N.W. by S.S.W.- 

 N.N.E. No. 8, and on the E.S.E.by S.S.W.- 

 N.N.E. No. 1. The area thus enclosed is 

 the most disturbed in this part of the moon. 

 IV A^ ^* the longer axis. 



IVA^J'S. 



This rill, which is not in Schmidt's Cata- 

 logue, was discovered on Rutherford's pho- 

 tograph by the author on July 21, 18()6. It 

 was observed with the Royal Society's te- 

 lescope of 4j-inch aperture, power 230, on 

 August 18, 1866. It lies in the line W.N.W.- 

 E.S.E. No. 5. 

 IVAf84. 

 IVAf37, IVAf86. 



IV A^ ^^, which is just at the S.E. corner 

 of the disturbed rectangular area before de- 

 scribed, is in the same line of direction. 

 IV A^7o, IV A^ ^^ IV A?«, IV Af 93^ 



IV A^ ^\ IV A^ 9^ IV A^ ^ IV A? «, 



IVAf^e, IVAf28^IVAfS'. 



These objects, with the exception of the 

 rill IV A' ^', are on the east side of the main 

 line ot fault N.N.W.-S.S.E. No. 5 ; the 

 mountain IV A?^' is just east of it. 

 IVA^«9, lYAi^^,TVi*^, IVAf9», 



IVA532, IVAf", IVA^'«. 



This is the main line of fault crossing the 

 area. It appears as a portion of a lucid 

 ray from Tycho in the full moon. 



It is noteworthy that these five lines of 

 upheaval and depression are found in this 

 area on the east of the main line of fault 

 only, including it. 



IVA^'7jVA^", IVA^'^ 



Forming the west border of Ptolemaeiis. 

 IV A^ "7. 

 IVAf^«. 



General Remarks. — The most interesting feature resulting from this dis- 

 cussion, confined as it is in extent, is the almost rectangular area of greatest 

 disturbance on IV A^ crossed by two main lines of fault which intersect each 

 other in the point IV A?36 . o^g, W.N.W.-E.S.E. No. 2 (IV A? 67, jy A? 8^), 

 coincident with the north-east wall of Albategnius, having several craters 

 opened on it, and running parallel with the S.S.W. and N.N.E. boundaries 

 of the area; the other, N.N.W.-S.S.E. No. 5, which breaking through 

 W.N.W.-E.S.E. No. 2 at the point of intersection, leads strongly to the 

 conclusion that the line N.N.W.-S.S.E. No. 5 is the most recent, and this 



