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Updated: June 3, 2025
As soon as the water-dust is heated the heat-waves scatter it again into invisible particles, which float away into the room. Even without the spirit-lamp, you can convince yourself that water-vapour may be invisible; for close to the mouth of the kettle you will see a short blank space before the cloud begins.
Secondly, there are very small quantities of ammonia, or the gas which almost chokes you in smelling-salts, and which, when liquid is commonly called "spirits of hartshorn." This ammonia is useful to plants, as we shall see by and by. Lastly, there is a great deal of water in the air, floating about as invisible vapour or water-dust, and this we shall speak of in the next lecture.
The fierce rollers of the spumous sea broke and recoiled, foaming upon the sandy beach, which they veiled with a haze of water-dust, almost concealing the smoke that curled from the mangrove-hedged "King Antonio's Town."
The clouds you see floating in the sky are made of exactly the same kind of water-dust as the cloud from the kettle, and I wish to show you that this is also really the same as the invisible steam within the kettle. I will do so by an experiment suggested by Dr. Tyndall. Here is another spirit-lamp, which I will hold under the cloud of steam see! the cloud disappears!
The heads of these comet-like masses are composed of nearly solid water, and are dense white in color like pressed snow, from the friction they suffer in rushing through the air, the portion worn off forming the tail between the white lustrous threads and films of which faint, grayish pencilings appear, while the outer, finer sprays of water-dust, whirling in sunny eddies, are pearly gray throughout.
In many places the precipices were 2000 feet in perpendicular height; and the streams of the upper fjeld, falling from the summits, lost themselves in evanescent water-dust before they reached the bottom. The bed of the valley was heaped with fragments of rock; which are loosed from above with every returning spring.
And now we are within the enceinte of the Borghese grounds, have passed the good-humoured custode at the gate, responded a hearty "da vero," to the "che bella qiornata" with which we are greeted, tarried for an instant by the little pond to the left, and heard the Babylonian willow susurrate the same salutation to the water under its boughs, and then make for, and soon reach, the large ever-spouting fountain which is scattering its comminuted water-dust far and near, and bathes our cheek refreshingly as we pass it: and now we are at the Borghese dairy, and now by Raphael's little frescoed house, untenanted within, and with a solitary robin, the custode of the porch; but at the back premises we come upon an artist in a blouse making a sketch.
The heavy sheets of rain in the air, the misty water-dust raised by the drops as they struck the roofs, and the vapour steaming from the earth, drew over everything a veil invisible yet visible, which softened outlines like the gauze curtain in a theatre. Through it loomed the Minster, larger and far more mysteriously impressive than Westray had in any moods imagined.
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