The most celebrated gardens of this description were those made by the Mexicans on the great lake which surrounds the capital; here they planted trees, and cultivated maize, pepper, and other plants necessary for their support. In progress of time, as these floating fields grew numerous from the industry of the people, they formed among them gardens for flowers and other odoriferous plants, which were employed in the worship of their gods, and which served also for the recreation of the nobles. Every day of the year, at sun-rise, innumerable vessels, laden with various kinds of flowers and herbs, cultivated on the water, arrived by the canal, at the great market-place of the capital. To form their floats, they first plait or twist willows, with roots of marsh plants, and upon this foundation they place the mud and dirt which they draw from the bed of the lake. When the owner of a garden wishes to change his situation, to remove from a disagreeable neighbour, or to come nearer his own family, he gets into his little vessel and tows the plantation after him.--Vide _Nov. His. de Mexico par le Abbé Francesco Saverio Clavigero_. The floating pleasure bath moored in the River Thames, near Westminster Bridge, is supported by empty casks; and this plan, if assisted by mooring-chains, may be applied to gardens of any reasonable extent, even in the broadest and most rapid rivers. No. XVIII. An artificial fountain, to be turned like an hour-glass, by a child, in the twinkling of an eye, it yet holding great quantities of water, and of force sufficient to make snow, ice, and thunder; with the chirping and singing of birds, and showing of several shapes and effects, usual to fountains of pleasure. NOTE. That a fountain may be made upon the principle of an hour-glass, and that when the upper division is exhausted, the lower may be elevated by a crank and lever, the fluid passing through the centre of its axis, we may easily conceive; but how a fountain of water can produce snow, ice, thunder, and the singing of birds, is a circumstance not easy to be comprehended. No. XIX. A little engine, within a coach, whereby a child may stop it, and secure all persons within it, and the coachman himself, though the horses be never so unruly, in full career; a child being sufficiently capable to unloose them, in what posture soever they should have put themselves, turning never so short; for a child can do it in the twinkling of an eye. NOTE.