Elements of biology; a practical Elements of biology; a practical text-book correlating botany, zoology, and human physiology elementsofbiolog00hunt Year: [c1907] 62 BOTANY are thus actually exterminated. Many of our common weeds have been introduced from other countries and have, through their numerous adaptations, driven out other plants which stood in their way. It is evident that the plants which are best adapted to changes in their surroundings, those plants which have allowed themselves to be molded to fit into new conditions, are the successful ones. Such is the Russian thistle. First
Elements of biology; a practical Elements of biology; a practical text-book correlating botany, zoology, and human physiology elementsofbiolog00hunt Year: [c1907] 62 BOTANY are thus actually exterminated. Many of our common weeds have been introduced from other countries and have, through their numerous adaptations, driven out other plants which stood in their way. It is evident that the plants which are best adapted to changes in their surroundings, those plants which have allowed themselves to be molded to fit into new conditions, are the successful ones. Such is the Russian thistle. First in- troduced from Russia in 1873, it spread so rapidly that in twenty years it had appeared as a common weed over an area of some twenty-five thousand square miles. It is now one of the greatest pests in our Northwest. Economic Value of Fruits. — Our grains are the cultivated progeny of wild grasses. Domestication of plants and animals mark epochs in the ^—^_ CORN '^ 640 to 3200 bushels per sauare mile \ \oyer3ZOO
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