3 12 Neighbourhood of. the Lunar Spot, Mare Crisium. 



dertaken by amateurs, and would be easily executed with a 

 little skill in outline and shading : their comparison with views 

 of the same objects in the relief of light and shade would be 

 instructive, and they might in process of time acquire con- 

 siderable importance as records of the present state of a surface, 

 whose markings may perhaps be found not exempt from change. 

 But to return to the Paludes Amane, or Neper a* and its neigh- 

 bourhood, as this region is styled by 13. and M. : grey tracts of 

 a similar character, but perfectly unconnected with these, and 

 less extensive, are to be found at no great distance to the W. 

 of the craters Hansen and Alhazen of B. and M. (see the dia- 

 gram of the Mare Crisium) ; another of these streaks lies 

 between the Alhazen of Schroter and Eimmart ; and B. and M. 

 describe several less easily seen in the extreme foreshortening- 

 of the limb. 



The region between the S. end of the Mare Crisium anof the 

 equatorial limb of the moon, comprising the craters Neper and 

 Schubert, has been very unsatisfactorily laid down by B. and 

 M. The result of Mr. Birt's revision of their work will in due 

 time, we trust, be made public : in the mean while, as the 

 requisite correction involves a still larger district lying on the 

 other side of the equator, we shall postpone our notice of it till 

 it comes before us in the Fourth Quadrant. 



There is nothing of especial interest to tho W. of the Ma/re 

 Crisium. To the N. and X \V. we meet with an elevated region, 

 as extensive as Germany, so entirely filled with craters and 

 ring-plains that the intervening mountain ridges are reduced 

 to a position of very inferior importance, and appear to serve 

 principally as means of communication, so to speak, between 

 the more conspicuous features. Several of these latter we shall 

 describe in detail. 



Qleomedes (No. I in the Index Map) is a fair specimen of 

 t lie formation which has been at diffi rent times styled a Walled, 

 Bulwark, or Ring Plain. This peculiar configuration of the 

 surface differs from the crater chiefly in the level character of 

 its interior, which is frequently little, if at, all, depressed be- 

 neath (he surrounding neighbourhood. It appears to be the 



type towards which the larger and older eralers approximate; 



but it is difficult to obtain a clear or satisfactory idea of the 



mode of its original construction, or the stages through which 



it may have passed. We shall End, however, hereafter still 

 more characteristic and better situated specimens than the one 

 now before as. Oleomedes is about seventy-eight miles in dia- 

 meter, and of ,i rounded quadrangular form ; less dark than t he 

 Ma/re Orinurn, and not everywhere of a uniform tint. Schroter 

 has noticed that ii is deepest beneath tho 10. wall, a peculiarity 



* This Utter in the mnp has more rcscrablanpo to a " il." 



