Leipzig, Veit & Co., 1901, 1903. Bound in one nice contemp. hcloth. Spine gilt. 64 pp. a. 8 textillustr. + 62 pp.
Reference : 45465
First edition of both lectures. In the first lecture he explains his theory of mutation as he published it in ""Die Mutationstheorie"" 1901. In the second lecture he develops further his theory of fertilization and crossfertilization. - Garrison & Morton: 241 (the 1903 lecture).
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