Our Common Insects

Our Common Insects
A Popular Account of the Insects of Our Fields, Forests, Gardens and Houses

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Our Common Insects by Alpheus Spring Packard

Published:

1873

Pages:

212

Downloads:

1,631

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Our Common Insects
A Popular Account of the Insects of Our Fields, Forests, Gardens and Houses

By

0
(0 Reviews)
The natural system, if we mistake not, is the genealogy of organized forms; when we can trace the latter, we establish the former. Considering how much naturalists differ in their views as to what is a natural classification, it is not strange that a genealogy of [Pg ii]animals or plants seems absurd to many. To another generation of naturalists it must, perhaps, be left to decide whether to attempt the one is more unphilosophical than to attempt the other.

Book Excerpt

bird, the lowering of the wing is the only active period, though the return stroke seems to sustain the bird, the air acting on the wing. The bird's body is horizontal when the wing gives a downward stroke; but when the beat is upward, the bird is placed in an inclined plane like a winged projectile, and mounts up on the air by means of the inclined surfaces that it passively offers to the resistance of this fluid.

[Illustration: 11. Trajectory of an insect's wing.]

[Illustration: 12. Trajectory of a bird's wing.]

In an insect, an energetic movement is equally necessary to strike the air at both beats up and down. In the bird, on the contrary, one active beat only is necessary, the down beat. It creates at that time all the motive force that will be dispensed during the entire revolution of the wing. This difference is due to the difference in form of the wing. The difference between the two forms of flight is shown by an inspection of the two accompanying figures (11, 12). An insect's wi

Susan Rooke - A Mixture of Fantasy and All Things Heaven and Earth
FEATURED AUTHOR - Susan Rooke is a multiple Pushcart nominee, Best of the Net and Dwarf Stars nominee, and author of the Space Between series. Her poems and short stories have appeared in publications such as The Christian Science Monitor and The Twilight Zone Magazine, among many others. She and her husband live surrounded by cows on a square of green, peaceful country in Central Texas. When she's not writing speculative fiction and poetry, she blogs fortnightly about real life, food and cocktails at SusanRooke… Read more