Afbeelding: Ernst Haeckel and his 1st wife Anna Sethe photo found on this excellent website: www.BioLib.de Originally this image was published in the book: Ernst Haeckel, Italienfahrt, Leipzig, 1921
Afbeelding: Ernst Haeckel and his 1st wife Anna Sethe photo found on this excellent website: www.BioLib.de Originally this image was published in the book: Ernst Haeckel, Italienfahrt, Leipzig, 1921