The author of this life of Erasmus Darwin, published in 1879, is given as Ernst Krause (1839 1903) a German biologist, but in fact more than half the book is a 'preliminary notice' by Charles Darwin, who explains in the preface that he has written it because of his access to family papers which add 'to the knowledge of Erasmus Darwin's character'. Krause wrote his original article in a German periodical because, in turn, he was intrigued by a reference made by Charles Darwin in the later editions of On the Origin of Species to his grandfather's anticipation in his Zoonomia (also reissued in...

Known for developing the concept of Mullerian mimicry, whereby poisonous species with a common predator display similar warning signals, the naturalist Johann Friedrich Theodor (Fritz) Muller (1821-97) spent most of his working life in Brazil. Having emigrated from Germany, owing partly to his radical atheism, he became a strong early supporter of Darwinism. Drawing on his studies of crustaceans, he originally published this work in German as Fur Darwin (1864), and sent the great naturalist a copy. Muller became a regular correspondent, and Darwin supported the translation of Muller's work,...