Dutch botanist and pioneering geneticist (1848-1935) known for suggesting the concept of genes, rediscovering the laws of heredity (unaware of Mendel's work), and for introducing the term 'mutation' into the scientific lexicon. Exceedingly rare ALS, one page, 3.5 x 5.5, April 20, 1891. Handwritten letter to English botanist and taxonomist Maxwell T. Masters, in part: "A year ago you had the kindness to ask for some seeds of Dipsacus sylvestris…I had then not the occasion to send you any, but am happy now to offer you the seeds, which will produce 10% of twisted stems, and in the other individuals, after cutting the young stem, twisted and other curiously changed branches. The seeds should be sown in place…distance of the specimens at least 30-40 cm." In fine condition.
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