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After glancing at the crater-shaped mountains on the western and southern border of the Mare Crisium, Alhazen, Hansen, Condorcet, Firmicus, etc., we pass southward into the area covered in Lunar Chart No. 2. The long dark plain south of the Mare Crisium is the Mare Fecunditatis, though why it should have been supposed to be particularly fecund, or fertile, is by no means clear.
Helen's, Mount Tacoma but these terrestrial volcanoes, except in elevation, are mere pins' heads in the comparison. In the eastern part of the Mare Fecunditatis lies a pair of relatively small craters named Messier, which possess particular interest because it has been suspected, though not proved, that a change of form has occurred in one or other of the pair.
Messier is also remarkable for the light streak, often said to resemble a comet's tail, which extends from the larger crater eastward to the shore of the Mare Fecunditatis. Goclenius and Guttemberg, on the highland between the Mare Fecunditatis and the Mare Nectaris, are intersected and surrounded by clefts, besides being remarkable for their broken and irregular though lofty walls.
Southwest from Mare Tranquillitatis, lies Mare Fecunditatis, the Sea of Fertility, the greatest in this hemisphere, as it occupies an extent of more than 300 thousand square miles, its latitude being 3° south and its longitude 50° west.
We next take up Lunar Chart No. 2, and pay a telescopic visit to the southwestern quarter of the lunar world. The Mare Tranquilitatis merges through straits into two southern extensions, the Mare Fecunditatis and the Mare Nectaris.
Then on the equator, in north latitude 5° and west longitude 25°, appeared the Sea of Tranquillity, Mare Tranquillitatis, occupying 121,509 square leagues of surface; this sea communicated on the south with the Sea of Nectar, Mare Nectaris, an extent of 28,800 square leagues, in south latitude 15° and west longitude 35°, and on the east with the Sea of Fecundity, Mare Fecunditatis, the vastest in this hemisphere, occupying 219,300 square leagues, in south latitude 3° and west longitude 50°. Lastly, quite to the north and quite to the south lie two more seas, the Sea of Humboldt, Mare Humboldtianum, with a surface of 6,500 square leagues, and the Southern Sea, Mare Australe, with a surface of 26,000.
In the southern division is seen Mare Nectaris, the Sea of Nectar, over whose soft heaving billows she is gently wafted by Love's caressing winds, "Youth on the prow and Pleasure at the helm." Not far off is Mare Fecunditatis, the Sea of Fertility, in which she becomes the happy mother of rejoicing children.
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