Each successive squeeze as we hold it between our fingers yields its generous response in a puff of brown smoke, which melts away apparently into air. But the puff-ball does not end in mere smoke. This vanishing purple cloud is composed of tiny atoms, so extremely minute as to require the aid of a powerful microscope to reveal their shapes. Each one of these atoms, so immaterial and buoyant as to be almost without gravity, floating away upon the slightest breath, or even wafted upward by currents of warm air from the heated earth, has within itself the power of reproducing another clump of puff-balls if only fortune shall finally lodge it in congenial soil. These spores are thus analogous to the seeds of ordinary plants. We have seen the myriadfold dispersion of its potential atoms in the cloud of spore-smoke from the puff-ball, but who ever thinks of a spore-cloud from a mushroom or a toadstool? Yet the same method is followed by all the other fungi, but with less conspicuousness. The puff-ball gives a visible salute, but any one of the common mushrooms or toadstools will afford us a much prettier and more surprising account of itself if we but give it the opportunity. This big yellow toadstool out under the poplar-tree, its golden cap studded with brownish scurfy warts, its under surface beset with closely plaited laminæ or gills, who could ever associate the cloud of dry smoke with this moist, creamy-white surface? We may sit here all day and watch it closely, but we shall see no sign of anything resembling smoke or dust. But even so, a filmy mist is continually floating away from beneath its golden cap, the eager breeze taking such jealous care of the continual shower that our eyes fail to perceive a hint of it. Do you doubt it? You need wait but a few moments for a proof of the fact in a pretty experiment, which, when once observed, will certainly be resorted to as a frequent pastime in leisure moments when the toadstool or mushroom is at hand. [Illustration: Spore Surface of a Polyporus]