The Origin And Significance of Spines: a Study in Evolution
The Origin And Significance of Spines: a Study in Evolution
Charles Emerson Beecher
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A4. — Secondarily from sexual selection. A5. — Secondarily from mimetic influences. B. Growth Force, In unicellular organisms, growth force, or bathmetic energy, must reside wholly in the germ cell, and therefore is con- cerned with reproduction as well as with cell differentiation. In multicellular organisms, the growth force is in both germ and soma cells, and its relative strength seems to depend upon Digitized by Google 132 C. E. Beecher — Otngin and Significance of Spines. its power to rep...roduce lost parts, often including germ cells as well as soma cells. In many of the lower classes, the growth force is able to complete a structure or lost part without the stimulus of use, which in higher animals often seems to be part of the necessary requirements for growth. Growth itself is the repetition of cells under nutrition and stimulus, and the latter may be hereditary or extra-individual. It is now recognized that since the division of a cell makes two unlike cells, each unlike the parent, such repetition will produce structures which present some degree or difference.
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