Summary

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Why may the atmosphere be termed a fourth kingdom of Nature?
Because it extends its influence in an equal degree over the three kingdoms, the animal, the vegetable, and the mineral, operates upon each after a distinct manner, and appears rather to be independent, and allied to all of them, than to be rightly included within any one.
Why is a knowledge of the atmosphere important to the naturalist?
Source: Gutenberg

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Why is air generally considered to be invisible?
Because, though a coloured fluid, and naturally blue, its colour acquires intensity only, or, in other words, becomes visible only, from the depth of the transparent mass. According to rigid Newtonians, air is transparent, or, rather, invisible; and the azure colour of the atmosphere arises from the greater refrangibility of the blue rays of light. Other philosophers imagine that the blue tint is inherent in air; that is, that the particles of air have the property of producing a blue colour, in their combination with light.
Source: Gutenberg

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We pass by Kennéh, on the east bank, from which travellers may go to Cosseir to embark on the Red Sea; we hasten by the remains of Kouft, the ancient Coptos, and the solitary propylon of Kous, standing alone without its temple,—to the plain of Thebes, to the most wonderful assemblage of ruins on the face of the earth.
All travellers agree that it is impossible to describe the effect produced by the colossal remains of this ancient capital
Source: Gutenberg

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