Krause's short biography originally appeared in the German evolutionary periodical Kosmos in February 1879. In this translation Darwin added a biographical contribution that is longer than Krause's, i.e. 127pp by Darwin versus 89pp. by Krause. Darwin paid frequent tribute to his grandfather Erasmus, but denied that Erasmus's ideas had influenced him significantly in the development of the theory of evolution by natural selection. Digital facsimile of the copy Darwin presented to his daughter Henrietta Litchfield from the Internet Archive at this link.