Appletons Popular Science Monthly volume 49
Appletons Popular Science Monthly volume 49
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In our eReader you can find the full English version of the book. Read Appletons Popular Science Monthly volume 49 Online - link to read the book on full screen. Our eReader also allows you to upload and read Pdf, Txt, ePub and fb2 books. In the Mini eReder on the page below you can quickly view all pages of the book - Read Book Appletons Popular Science Monthly volume 49
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Such blos- soms are apt to be yellow or white, with flat, open corollas, and without spurs, honey jars, or covering to protect the pollen. So the milkweed is something of a problem to the evolutionary botanist. Can he, for example, explain the fate of those hapless flies which, like Haman of old, come to a feast, but get only im- prisonment and death ? These unfortunates are but a small pro- portion of the milkweed's fly visitors. The great majority make off, after taking their fill of nectar, ...without carrying off any por- tion of the pollen which the flower is endeavoring to send to its neighbors. This waste of nectar is bad for the milkweed, which would be better off with fewer fly visitors. So the flower would profit by any device which would discourage these many flies, without deterring those useful and desired visitors, the bees. Will flies learn after a while to shun the milkweed's dangerous sweets, so that they may all be left for worthier and more wel- come guests ? And how many generations will it take this pro- verbially foolish insect to lay the lesson to heart ?
What to read after Appletons Popular Science Monthly volume 49?
You can find similar books in the "Read Also" column, or choose other free books by William Jay Youmans to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
Such blos- soms are apt to be yellow or white, with flat, open corollas, and without spurs, honey jars, or covering to protect the pollen. So the milkweed is something of a problem to the evolutionary botanist. Can he, for example, explain the fate of those hapless flies which, like Haman of old, come to a feast, but get only im- prisonment and death ? These unfortunates are but a small pro- portion of the milkweed's fly visitors. The great majority make off, after taking their fill of nectar, ...without carrying off any por- tion of the pollen which the flower is endeavoring to send to its neighbors. This waste of nectar is bad for the milkweed, which would be better off with fewer fly visitors. So the flower would profit by any device which would discourage these many flies, without deterring those useful and desired visitors, the bees. Will flies learn after a while to shun the milkweed's dangerous sweets, so that they may all be left for worthier and more wel- come guests ? And how many generations will it take this pro- verbially foolish insect to lay the lesson to heart ?
What to read after Appletons Popular Science Monthly volume 49?
You can find similar books in the "Read Also" column, or choose other free books by William Jay Youmans to read onlineMoreLess
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