The Ohio Naturalist And Journal of Science, Volumes 1-4
The Ohio Naturalist And Journal of Science, Volumes 1-4
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It is a well-known fact that the leaves of many fossil plants from the Cretaceous have entire borders, while the modern representatives of the same genera are often serrate, denticulate or lobed. Turn- ing now to the seedling of the ordinary watermelon (Fig. la), we find that the leaves develop in succession from the entire to the mature, lobed form. The cotyledons are oval and entire, while the first leaf is almost an exact counterpart of the variety under consideration. In the second leaf the... lobed condition is ^ig.
fl, A young seedling of the usual form.
^, lycaf of usual form, r, I^eaf of special form.
Digitized by VjOOQIC Feb., 1903.] A Hermit Thrush Song. 37 ^ beginning to appear while the third leaf would have the normal form of the mature plant. On this account I regard this as a case of atavism rather than an ordinary mutation ; or it is prob- able that the watermelon embryo, in passing from entire to lobed leaves, is repeating some of the past stages in the history of its race.
What to read after The Ohio Naturalist And Journal of Science, Volumes 1-4?
You can find similar books in the "Read Also" column, or choose other free books by Ohio State University. Biological Club, Ohio Academy of Science to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
It is a well-known fact that the leaves of many fossil plants from the Cretaceous have entire borders, while the modern representatives of the same genera are often serrate, denticulate or lobed. Turn- ing now to the seedling of the ordinary watermelon (Fig. la), we find that the leaves develop in succession from the entire to the mature, lobed form. The cotyledons are oval and entire, while the first leaf is almost an exact counterpart of the variety under consideration. In the second leaf the... lobed condition is ^ig.
fl, A young seedling of the usual form.
^, lycaf of usual form, r, I^eaf of special form.
Digitized by VjOOQIC Feb., 1903.] A Hermit Thrush Song. 37 ^ beginning to appear while the third leaf would have the normal form of the mature plant. On this account I regard this as a case of atavism rather than an ordinary mutation ; or it is prob- able that the watermelon embryo, in passing from entire to lobed leaves, is repeating some of the past stages in the history of its race.
What to read after The Ohio Naturalist And Journal of Science, Volumes 1-4?
You can find similar books in the "Read Also" column, or choose other free books by Ohio State University. Biological Club, Ohio Academy of Science to read onlineMoreLess
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