The National Geographic Magazine, Volume 104National Geographic Society, 1953 - Geography Indexes kept up to date with supplements. |
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Page 203
... Plant - growth scientists work as well with the wonder drugs of modern medicine , the antibiotics . They find that these organic compounds , which inhibit or destroy disease- producing bacteria , viruses , or fungi , will move through a ...
... Plant - growth scientists work as well with the wonder drugs of modern medicine , the antibiotics . They find that these organic compounds , which inhibit or destroy disease- producing bacteria , viruses , or fungi , will move through a ...
Page 204
... plant life . The phenomenon is called photoperiodism . But how it works is still a mystery . Some plants blossom only in the lengthen- ing days of spring . Others require more dark- ness than daylight and bloom in the fall when the ...
... plant life . The phenomenon is called photoperiodism . But how it works is still a mystery . Some plants blossom only in the lengthen- ing days of spring . Others require more dark- ness than daylight and bloom in the fall when the ...
Page 213
... plants are being se- lected from the wild and domesticated . In effect , Uncle Sam's plant breeders are doing what the first farmers started with corn and wheat perhaps 3,000 years ago - developing a new cultivated crop - but in a few ...
... plants are being se- lected from the wild and domesticated . In effect , Uncle Sam's plant breeders are doing what the first farmers started with corn and wheat perhaps 3,000 years ago - developing a new cultivated crop - but in a few ...
Contents
Fact Finding for Tomorrows Planes A Little Faninabox Wind | v |
All America Mingles in the Prairie State | ix |
Rip Van Winkle of the Underground North Americas Much Misunder | xii |
Copyright | |
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