314 



Royal Society : — 



Fig. I. — Mars as seen on the 27th of September and on several other occasions till 

 the 13th of December. (Longitude 0°.) 



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 tlian in fig. 3 : seen November 11th. 



