Heredity And the Origin of Species
Heredity And the Origin of Species
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It will be of interest to this assembly to know that Ameri- can botanists and horticulturists have made early observa- tions of direct interest in this connection. Thus Dr. Arthur HoUick, while a student at Columbia University in 1879, said in writing of white varieties of colored plants : 'Tirst then, we have to consider those sports of nature where Digitized by Google lO HEREDITY, AND THE ORIGIN OF SPECIES.
there has been a sudden change, without any intermediate steps, from a plant with colo...red flowers to a pure white variety: such may be termed "negative" varieties, since their peculiarity is due rather to an absence of color, than to the presence of white. Not only does the flower show the characteristic absence of color, but the leaves, stem, and, in fact, the entire plant, are invariably of a lighter green; and if any red be normal to the stem (which is often the case), this will also be of a lighter shade. It has often been urged that these albinos are mere 'sports' of nature with nothing constant about them, .
What to read after Heredity And the Origin of Species?
You can find similar books in the "Read Also" column, or choose other free books by Daniel Trembly Macdougal to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
It will be of interest to this assembly to know that Ameri- can botanists and horticulturists have made early observa- tions of direct interest in this connection. Thus Dr. Arthur HoUick, while a student at Columbia University in 1879, said in writing of white varieties of colored plants : 'Tirst then, we have to consider those sports of nature where Digitized by Google lO HEREDITY, AND THE ORIGIN OF SPECIES.
there has been a sudden change, without any intermediate steps, from a plant with colo...red flowers to a pure white variety: such may be termed "negative" varieties, since their peculiarity is due rather to an absence of color, than to the presence of white. Not only does the flower show the characteristic absence of color, but the leaves, stem, and, in fact, the entire plant, are invariably of a lighter green; and if any red be normal to the stem (which is often the case), this will also be of a lighter shade. It has often been urged that these albinos are mere 'sports' of nature with nothing constant about them, .
What to read after Heredity And the Origin of Species?
You can find similar books in the "Read Also" column, or choose other free books by Daniel Trembly Macdougal to read onlineMoreLess
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