A landmark look at how new plant forms arise—suddenly, not gradually—and what that means for evolution and breeding.
This edition presents Hugo de Vries’s mutation theory, explaining how new species and varieties can originate by discrete jumps. It frames the difference between constant variability and true mutability, and shows how experiments with plants illuminate the laws of inheritance and the origin of species. Accessible to students and general readers, the work links scientific ideas to practical insights for horticulture and agriculture.
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