ENGINES, GARDEN. These are of two descriptions, several forms of both being in use in gardens. One is termed a Hand Engine, from its being small and carried by the hand; the other is the Barrow Engine, so-called from being constructed on two wheels, and having a handle fixed to either side. Beyond throwing a continuous stream from the jet when in use, many of the former kind are not superior to a good syringe. A Barrow Engine is most useful for syringing trees or plants that require a force of water. Peach and other fruit-trees, either in houses or on walls outside, may be syringed frequently in the season of growth, excepting when in flower, and kept clean much more effectually by this than by any other method. This kind of Engine is also most useful for washing the glass inside of fruit and plant houses, at any time. The Barrow Engine is composed of an oval-shaped cistern, made preferably of wood, but sometimes of galvanised iron. It is invariably broader each way at the bottom than at the top. The lid is generally perforated, and either movable or fixed in two parts on hinges to the cross bridge that holds all the other parts in position. The working arrangements inside are very similar in principle to that of a force-pump, and consist of two upright cylinders, one containing a piston and rod, and the other connected to this at the base for conducting the water, by means of a nozzle that turns round as desired, to any place within the reach of the force applied. The cylinder, with the piston inside, is connected with the water in the cistern, and has a valve at its base. On raising the piston by the handle attached to the rod at the top, the water passes into the cylinder, and the valve closes. By the next downward pressure, the water opens another valve and passes into the adjoining cylinder; and, as the latter valve will not allow it to return, and the outlet is frequently only a small hole, the water has to pass through in proportion to the size and the force applied. Many who have to use a Garden Engine almost daily in summer, have an insufficient knowledge of its construction and mode of working, and the result is that the leverage of the handle connected with the piston rod, and the great pressure of water consequently obtained, is unduly exercised, and the valves, or something else, soon become either out of order or broken. A perforated grating or rose should be placed at the base of the cylinder opening to receive the water, in order to prevent anything getting inside. Should an obstruction be caused, the use of the pump must be discontinued until the evil has been removed. These detailed remarks on the construction of the Garden Engine are given with a view to its being more generally understood and more carefully used.