But in the salt as in the fresh water aquarium, vegetation is necessary for a healthful condition of the inmates. Here we see on a miniature scale that wonderful balance of organic forces which exists on the larger globe around us. The vegetation exhales the purifying oxygen, which renders the water fit for sustaining animal life; the fishes and other animals in their turn give forth the carbonic-acid gas, which is equally needed for the healthful development of the plants; while, last of all, the snails—those little scavengers nature has so wisely provided—remove such minute portions of decaying matter as might otherwise pass unnoticed, and so contaminate the entire water in the globe.
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THE WOODEN WINDMILL.
So common were these little toys among the companions of my childhood, that it seemed almost superfluous to insert what I supposed every boy must be familiar with; but upon questioning my young friends, I find that very few of them away from the sea-coast towns of New England, and the sailor-like influence or atmosphere which permeates them, know anything of the pretty little windmills, or weather-vanes, which we copied from those of our sailor friends.
It was no uncommon thing in those days for some boy less ingenious than his companions to use a little strategy, and so get his work done for him by proxy; and the manner in which he would proceed was generally something like this: Early some bright spring morning, with jackknife and shingle in hand, he would saunter down to the wharf, upon which he knew at an early hour the old sea captains of the village would assemble, and wait his chance. Here the old captains, and the sailors, who by reason of their advanced age took the same honorary title, were wont to gather on the sunny side of the weather-beaten old store-house, and watch from under their heavy gray eyebrows the bay stretched out before them, while they enjoyed their pipes, and lived over again the wonderful adventures and disasters of their successive voyages; and here he would watch for his prey, little suspected by those kindly old souls, who had, years long gone by, ruled with iron will over the crews and destinies of great ships, known to him only by their names. Occasionally two or three would arrive at the wharf together, and he knew his chances were gone for that day at least; but usually some one, whose breakfast may not have claimed as much attention as usual, would be seen making his way down the quiet village street, easily recognized by his rolling gait, his inseparable pipe, and manner of scanning the clouds and horizon. Now our friend would begin to whittle in earnest, soon attracting the attention of the ancient mariner by his awkward movements. Of course, he would receive no end of ridicule for his stupidity; but as that did not sink very deep in his boyish soul, he was prepared to pay a greater price, if necessary, for the work he expected to receive. It not unfreqently happened that the old fellow would take the shingle to show him how to begin, and would get so much interested in the work that he would offer to do it during the day, and would actually whittle away on the little boat, while he or one of his companions related for the fiftieth time how the Nautilus passed through so many hair-breadth escapes, and finally reached port at last, with no soul missing and cargo untouched.
It was during these long voyages, when time hung heavily on their hands, that they acquired their skill in fashioning these mechanical toys, which almost always had for their motive power the wind or the waves.
