PLATE VIII. 



moon's age 23 DAYS, 7 HOURS. JULY 28, 189I. LICK OBSERVATORY. 



At this stage of the waning moon the most interesting of its fields are no longer visible. There 

 are few that command attention in this plate. It may be noted that the system of light bands and 

 the central patches whence they proceed, that have their center in Kepler, are still very bright. 

 The dark mare-like floor of Grinialdi is visible near the bright margin of the sphere. The observer 

 may obtain something of the impression, such as is afforded by good seeing with a powerful 

 telescope, that the Oceanus Procellarum is a relatively shallow sea, by the number of fragments of 

 what seems to have been the more ancient surface that protrude through it. 



96 



