PLATE IV. 



MOON'S AGE 8 DAYS, 22 HOURS. LICK OBSERVATORY, 1 890. 



This plate represents the moon as it appears eighteen hours later than shown in the preced- 

 ing plate. The pictures were taken at different times of the year, which accounts for the difference 

 in the position of the terminator or illuminated margin. It will be observed that several new 

 features have appeared beyond the southern end of the Apennines. The light bands are more 

 visible and the contrast of hue between the maria and the upland country is less distinct. 



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