34 : REPORT—1868, 
IV A& 65, and grazes the N.E. end of the mountain-arm IV A**, The pre- 
cipitous E. face of the mountain TY A‘ appears to have been produced by 
this fault. 
. 63, The N. part of the fault IV A" IV A*®, Direction N. by W.-8. 
by E. 
This fault appears to have originated in connexion with the outburst which 
produced the crater IV A” ”, as it forms one of a system of faults N. and 8. 
of that light-centre (see fig. 1, ante p. 13). This fault, on the N. of LY A”2, is 
first apparent in the mountain-chain IV A”!*, which is situated on it. From 
this mountain-chain the faults [V A" and IV A”* diverge. The course of 
IV A" is described in letterpress, areas [V A*, LV AS, pp. 19, 20, and Report 
Brit. Assoc. 1866, pp. 255, 256. IV A" TV A®° passes along the W. range 
of TV A” 2 to the W. wall of IV A*18, where it intersects the faults [TV A” 3, 
FV Af ®, on the “ ray from Tycho.” Tt then passes along the range on which 
IV AB ® ig situated, where it intersects the fault JV Af. It next passes 
through IV Af 4 to the W. border of IV A*#°, where it intersects the fault 
IV AP #2, and is traced still more northerly through the mountain I Af 3! 
(Lohr. Sec. I. 65) towards Manilius. 
The evidence of the more recent origin of this fault than the “ray from 
Tycho,” as compared with that of the fault IVA" IV A&2 TV At? 
(see letterpress, areas IV A*, IV AS, p. 20, and Report Brit. Assoc. 1866, p 
256), is not so striking as in that instance. There does not appear at the 
point of intersection to be any breaking through of the fault IY A” *3 
Iv Af ® by the fault IV A”% IV A*®&; and therefore it is not so easy to 
determine whether IV A” * IV A*® be posterior to the ray from Tycho and 
contemporaneous with IV A’! TV Af*o TV A*”, or otherwise. There can; 
however, be very little doubt of its connexion with the crater TY A"?, and 
that it forms one of a system of “ faults ”’ of which that crater is the centre. 
64. A mountain-peak at the 8. end of IY A** on the line of fault 
Pee TAPS: 
65. A shallow crater W. of [TV Af ™, on the line of fault TV A” 25 TY AB 68, 
Longest diameter (on a line passing through IV A !*) 6":71, shortest (at right 
angles to this line) 4°47, mag. 0-33, the fifth crater in order upon area 
IV A%, 1865, March 6. 
This crater is shown by B. & M. but not by Lohrmann, B. & M. give a 
crater between ITV A® ® and IV A 821, which is in Lohrmann, and on Ruther- 
ford’s photogram, 1865, March 6, appears to be the N.E. angle of the depres- 
sion TV Af 15 (see [V Af 15); IV Af © appears to be shallow, and is situated on 
a mountain-mass which is nearly in the line of fault LV A**!, With a morning 
terminator past Copernicus, the shadow, which is scarcely discernible, measures 
2-7; the longest diameter =6":71; therefore the proportion of shadow to 
illuminated interior is as 1 to 1:483. It is noteworthy that TV Af, TV Af 15, 
and IV A®?! are similarly situated with regard to the mountains - on which 
they are opened; all three are near faults, and all are suggestive of the 
exertion of a force by which the masses on which they occur were thrown 
towards §.S.E., the direction of the faults in this neighbourhood coincident 
with the “rays from Tycho.” 
66. The mountain-mass on which IV A*® is opened. Length of crest 
11:65, breadth of base at 8. end, including crater, 12°03, at N. end 8°25. 
67. A low mountain-range in continuation of IV A*4; it has upon it 
we poet 
A plateau west of, or avery gentle slope westward from, the §.W. 
rim ae Ty Ab 2, 
