The large dark tract on the left is _De La Rue Ocean_, the isolated oval spot near the centre is _Terby Sea_, and on the right is the western end of _Maraldi Sea_, with strongly indented border. Directly north of (below) De La Rue Ocean, is _Maedler Continent_; above it stretches _Jacob Land_; and surrounding Terby Sea is _Secchi Continent_. Extending into the centre of De La Rue Ocean is a curious double peninsula, called, in consequence of the dimness of former observations, _Hall Island_. The sharply defined, white-crested northern borders of De La Rue Ocean and Maraldi Sea may indicate the existence there of lofty coast ranges, more or less constantly covered with opaque clouds strongly reflecting light. The white spot in the centre of Maedler Continent, of a temporary nature, has a similar explanation. The intervals of olivaceous gray on Secchi Continent and elsewhere may perhaps be ascribed to the flooding and drying up of marshes and lowlands, as these markings have been observed to vary somewhat in connection with the change of seasons on Mars. The greenish tints observed along the planet's limb, alike on the darker and lighter surfaces, are probably due to an optical effect, the green being complementary to the prevailing red of the disk. The brilliant oval white spot near the southern (upper) pole of the planet is a so-called polar spot, in all probability consisting of a material similar to snow or ice and here observed in the midst of a dark open sea. _Approximate scale, 300 miles--1 inch._ PLATE IX.--THE PLANET JUPITER. _Observed November_ 1, 1880, _at 9h. 30m. P. M._