1863.] 



433 



Fig. 2. The appearance of Mars at longitude 90, with long oblique ridges south 

 of the great boundary, and nearly or quite running into the northern land, 

 here less broad than in fig. 3 : seen November llth. 



Fig. 3. The hemisphere of Mars, opposite to fig. 1 : seen October 15th and 16th. 

 With a specially dark band 



