The shrubbery and vegetation of the moon is all metallic. Vegetable life nowhere exists; but the forms of some of the shrubs and trees are exceedingly beautiful. The highest trees do not exceed twenty-five feet, and they appear to have all acquired their full growth. The ground is strewn with flowers, but they are all formed of metals--gold, silver, copper, and tin predominating. But there is a new kind of metal seen everywhere on tree, shrub and flower, nowhere known on the earth. It is of a bright vermilion color, and is semi-transparent. The mountains are all of bare and burnt granite, and appear to have been melted with fire. The committee called the attention of the boy to the bright "sea of glass" lately observed near the northern rim of the moon, and inquired of what it is composed. He examined it carefully, and gave such a minute description of it that it became apparent at once to the committee that it was pure mercury or quicksilver. The reason why it has but very recently shown itself to astronomers is thus accounted for: it appears close up to the line of demarcation separating the light and shadow upon the moon's disk; and on closer inspection a distinct cataract of the fluid--in short, a metallic Niagara, was clearly seen falling from the night side to the day side of the luminary. It has already filled up a vast plain--one of the four that exist on the moon's surface--and appears to be still emptying itself with very great rapidity and volume. It covers an area of five by seven hundred miles in extent, and may possibly deluge one half the entire surface of the moon. It does not seem to occasion much apprehension to the inhabitants, as they were soon skating, so to speak, in platoons and battalions, over and across it. In fact, it presents the appearance of an immense park, to which the Lunarians flock, and disport themselves with great gusto upon its polished face. One of the most beautiful sights yet seen by the lad was the formation of a new figure, which he drew upon the sand with his finger. The central heart was of crimson-colored natives; the one to the right of pale orange, and the left of bright blue. It was ten seconds in forming, and five seconds in dispersing. The number engaged in the evolution could not be less than half a million. Thus has been solved one of the great astronomical questions of the century.