Darwin's statements concerning hybrids of the genera mentioned in The Variation of Animals and Plants Under Domestication, based on reports of others, need to be corrected in many respects.
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"I have been patient, and patience is the key to discovery."
"The value and utility of any experiment are determined by the fitness of the material to the purpose for which it is used, and thus in the case before us it cannot be immaterial what plants are subjec…"
"You should regard the numerical expressions as being only empirical, because they can not be proved rational."
"The value and utility of any experiment are determined by the fitness of the material to the purpose for which it is used."
"Whether they will retain the characteristics of the hybrid, or whether they will show variations, will be determined by next year's observations."
From a letter to Carl Nägeli, a direct and critical statement about a leading contemporary scientist.
Date: 1870
PhilosophicalFound in 1 providers: gemini
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This quote asserts that Darwin's published claims about plant and animal hybrids — drawn from secondhand accounts rather than direct experimentation — contain multiple inaccuracies requiring correction. Mendel is not dismissing Darwin broadly, but targeting specific conclusions Darwin reached without performing controlled experiments himself. The statement reflects a core scientific principle: conclusions must rest on firsthand, reproducible data, not aggregated reports from others whose methods and conditions cannot be independently verified.
Mendel spent eight years conducting over 29,000 controlled pea-plant crosses in his monastery garden, meticulously tracking inheritance ratios across generations. His entire methodology rested on firsthand, quantified observation — the direct opposite of Darwin's habit of synthesizing others' reports. Correcting Darwin, the era's unchallenged authority on natural history, reflects Mendel's intellectual independence and deep trust in experimental rigor over reputation. He knew his own data was precise where Darwin's secondhand sources were not.
Darwin's 'Variation of Animals and Plants Under Domestication' appeared in 1868, two years after Mendel's own heredity paper. Scientists had no concept of genes or chromosomes; Darwin himself proposed 'pangenesis,' a flawed heredity theory. Naturalists routinely compiled observations from farmers, breeders, and explorers rather than running controlled experiments. Mendel's critique exposed the fundamental methodological gap between observational natural history and experimental genetics — a tension that defined 19th-century biology and would not be resolved until the 1900s.
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