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The same fact holds good with flowering plants, of which the two main divisions have been founded on characters derived from the embryo, on the number and position of the embryonic leaves or cotyledons, and on the mode of development of the plumule and radicle.
In thirty-eight or nearly a third of the tales Dr. Bolte gives a formula, or radicle, summing up the "common form" of the story, and I am happy to find that in those cases, which occur in the early part of the present volume, my own formulæ, agree with his, though of course for the purposes of this book I have had to go into more detail. Dr.
The shooting down of the radicle or undeveloped root, and the springing up of the plumule or undeveloped stalk, is accordingly due to no vital principle in the seed, but to the complexity or entanglement of the molecules wrapped up in their integumentary environment.
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