File:Bird lore (1912) (14564089300).jpg

Identifier: birdlore141912nati (find matches)
Title: Bird lore
Year: 1899 (1890s)
Authors: National Committee of the Audubon Societies of America National Association of Audubon Societies for the Protection of Wild Birds and Animals National Audubon Society
Subjects: Birds Birds Ornithology
Publisher: New York City : Macmillan Co.
Contributing Library: Smithsonian Institution Libraries
Digitizing Sponsor: Biodiversity Heritage Library

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on, ofsomething. This something is the air we breathe, and the air far up aboveus which we could not breathe and live, and the air around not only us butalso the entire earth. All of these kinds of air together are called the atmosphere, and you mustlearn to think of the air or atmosphere as something which is movable, whichcan be made hot or cold, wet or dry, which has weight and height, and which The Audubon Societies 55 aiiay be dense, that is, thick and pressed together, or, on the contrary, thinand light. If the air all over and around the earth was of exactly the same degree ofheat or cold (temperature), and of exactly the same weight (pressure), and of-exactly the same wetness or dryness (humidity), as well as of exactly the samethickness (density), it would have no motion at all and there would be onlyone kind of weather everywhere. But this is never the case. The air may be very heavy in one place andvery light in another; or, it may be quiet where you live, while moving at a
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l.Ikh l;()\ PROTECTED FROM CATSPhotographed by Howard H. Cleaves furious rate elsewhere; it may even be freezing cold about the polar seas, and■at the same time summer-warm near the Gulf of Mexico. All of these states, or conditions, of the air, taken at the same time but in•diiferent places and at different heights (altitudes), are what is called theweather, and it is very important to understand all we can about the weather,since we are obliged to live on this earth in weather which constantly changes. The air in motion is called wind. When the wind blows hard, we reallyhear that part of the weather. The air full of water-vapor falls upon us inrain or snow, according as it is warm or cold. When it rains or snows, we can 56 Bird - Lore see that part of the weather. The air full of heat or cold we feel, and we callit hot or cold weather, as the season may be. When the air is full of dust-particles or smoke, then we smell not the air,but the foul matter in it. It is when the air is

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