Methods And Causes of Evolution
Methods And Causes of Evolution
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Bulletin 81, Bureau of Plant Industry, U. S. Dept. of Agriculture^ 1905.
136 Digitized by VjOOQIC MUTUAL RELATIONS OF PBINCIPAL FACTORS. 25 The facts are concrete and their relations obvious. The members of each species are diverse (heterism). They freely interbreed among themselves (symbasis). They produce successive generations (de- scent) . Later generations differ from the earUer (evolution). With- out diversity, interbreeding has no significance, and descent is not accompanied by evolution.... Heterism, symbasis, descent, and evolu- tion form a continuous series, a complete chain of phenomena. For some purposes the four processes may be described as distinct, but physiologically they are mere phases or aspects of organic existence, each at once requiring and assisting the others.
Thus, the constitutions of species and the methods by which they are propagated show that they are in motion. We no longer seek to prove that species evolve; we see that they do and understand why they must continue to do so as long as they remain groups of normally diverse, broadly interbreeding organisms.
What to read after Methods And Causes of Evolution?
You can find similar books in the "Read Also" column, or choose other free books by Orator Fuller Cook to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
Bulletin 81, Bureau of Plant Industry, U. S. Dept. of Agriculture^ 1905.
136 Digitized by VjOOQIC MUTUAL RELATIONS OF PBINCIPAL FACTORS. 25 The facts are concrete and their relations obvious. The members of each species are diverse (heterism). They freely interbreed among themselves (symbasis). They produce successive generations (de- scent) . Later generations differ from the earUer (evolution). With- out diversity, interbreeding has no significance, and descent is not accompanied by evolution.... Heterism, symbasis, descent, and evolu- tion form a continuous series, a complete chain of phenomena. For some purposes the four processes may be described as distinct, but physiologically they are mere phases or aspects of organic existence, each at once requiring and assisting the others.
Thus, the constitutions of species and the methods by which they are propagated show that they are in motion. We no longer seek to prove that species evolve; we see that they do and understand why they must continue to do so as long as they remain groups of normally diverse, broadly interbreeding organisms.
What to read after Methods And Causes of Evolution?
You can find similar books in the "Read Also" column, or choose other free books by Orator Fuller Cook to read onlineMoreLess
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