Mendel's principles of heredity ; a defence

Introduction--Mendel, G. Experiments in plant-hybridisation (tr. of a paper originally published in the Verhandl. Naturf. ver. in Brünn, 1866]--Mendel, G. On hieracium-hybrids obtained by artificial fertilisation [tr. of a paper originally published in the Verhandl. Naturf. ver. in Brünn, 1870]--A defence of Mendel's principles of heredity [against the criticism of W.F.R. Weldon]