 | Charles Carroll Bombaugh - Literature - 1860 - 538 pages
...close to the ground, rain is almost surely approaching. Can you account for this ? Hal. — Swallows follow the flies and gnats, and flies and gnats usually...down from them by the mixture with cold air; but when the warm and moist air is close to the surface, it is almost certain that, as the cold air flows down... | |
 | David Ames Wells - Reference books - 1863 - 470 pages
...surely approaching ; for swallows follow the flies and gnats, which delight in warm strata of air. Now, as warm air is lighter, and usually moister, than...cold air, when the warm strata of air are high there Ls less chance of moisture being thrown down from them by their mixture with cold air ; but when the... | |
 | 1864 - 422 pages
...of air ; and as warm air is lighter, and usually moister, than cold air, when the warm strata of our air are high, there is less chance of moisture being...from them by the mixture with cold air ; but when the warm and moist air is close to the surface, it is almost certain that, as the cold air flows down... | |
 | Zoology - 1869 - 392 pages
...fiiie matltcr may lie expected ? Because swallows follow flies and gnats, and these delight in warm air ; and as warm air is lighter, and usually moister...down from them by the mixture with cold air. But when the warm and moist air is close to the surface, the flies and swallows fly low, and it is almost certain... | |
 | John Timbs - Animal behavior - 1869 - 374 pages
...surely approaching ; for swallows follow the flies and gnats, which delight in warm strata of air. Now, as warm air is lighter, and usually moister than cold...chance of moisture being thrown down from them by their mixture with cold air ; but when the warm and moist air is close to the surface, it is almost... | |
 | Sir Humphry Davy - Fishing - 1870 - 334 pages
...close to the ground, rain is almost surely approaching. Can you account for this ? HAL. — Swallows follow the flies and gnats, and flies and gnats usually...down from them by the mixture with cold air; but when the warm and moist air is close to the surface, it is almost certain, that, as the cold air flows down... | |
 | Charles Carroll Bombaugh - Literary curiosa - 1874 - 876 pages
...flies and gnats usually delight in warm strata of air; and as warm air is lighter, and usually moistcr, than cold air, when the warm strata of air are high,...down from them by the mixture with cold air; but when the warm and moist air is close to the surface, it is almost certain that, as the cold air flows down... | |
 | Charles Carroll Bombaugh - Anthologies - 1875 - 868 pages
...close to the ground, rain is almost surely approaching. Can you .account for this ? Hal. — Swallows follow the flies and gnats, and flies and gnats usually...down from them by the mixture with cold air; but when the warm and moist air is close to the surface, it is almost certain that, as the cold air flows down... | |
 | New reader - 1879 - 330 pages
...and gnats, and flies and gnats usually delight in warm strata* of air; when the warm strata of our air are high, there is less chance of moisture being...from them by the mixture with cold air ; but when the warm and moist air is close to the surface, it is almost certain that, as the cold air flows down... | |
 | Hints - 1880 - 172 pages
...close to the ground, rain is almost surely approaching. This indication is thus explained':— Swallows follow the flies and gnats, and flies and gnats usually...from them by the mixture with cold air ; but when the warm and moist air is close to the surface, it is almost certain that, as the cold air flows down... | |
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Swallows follow the flies and gnats, and flies and gnats usually delight in warm strata of air; and as warm air is lighter, and usually moister than cold air, when the warm strata of air are high, there is less chance of moisture being thrown down from... 
