Produced by Sue Asscher Facts and Arguments for Darwin by Fritz Müller WITH ADDITIONS BY THE AUTHOR Translated from the German by W. S. DALLAS, F.L.S. Assistant Secretary to the Geological Society of London WITH ILLUSTRATIONS LONDON: JOHN MURRAY, ALBEMARLE STREET 1869 Mr. DARWIN'S WORKS A NATURALIST’S VOYAGE ROUND THE WORLD; being a Journal of Researches into the Natural History and Geology of Countries visited. Post 8vo. 9 shillings. THE ORIGIN OF SPECIES, BY MEANS OF NATURAL SELECTION; or, the Preservation of Favoured Races in the Struggle for Life. Woodcuts. Post 8vo. 15 shillings. THE VARIOUS CONTRIVANCES BY WHICH BRITISH AND FOREIGN ORCHIDS ARE FERTILISED BY INSECTS, and on the Good Effects of Intercrossing. Woodcuts, Post 8vo. 9 shillings. THE VARIATION OF ANIMALS AND PLANTS UNDER DOMESTICATION. Illustrations. 2 volumes, 8vo. 28 shillings. Contents TRANSLATOR’S PREFACE AUTHOR’S PREFACE Chapter 1. Introductory. Chapter 2. The Species of Melita. Chapter 3. Morphology of Crustacea. Chapter 4. Sexual Peculiarities and Dimorphism. Chapter 5. Respiration in Land Crabs. Chapter 6. Structure of the Heart in Edriophthalma. Chapter 7. Developmental History of Podophthalma. Chapter 8. Developmental History of Edriophthalma. Chapter 9. Developmental History of Entomostraca, Cirripedes, and Rhizocephala. Chapter 10. On the Principles of Classification. Chapter 11. On the Progress of Evolution. Chapter 12. Progress of Evolution in Crustacea. Index TRANSLATOR’S PREFACE My principal reason for undertaking the translation of Dr. Fritz Müller’s admirable work on the Crustacea, entitled ‘Für Darwin,’ was that it was still, although published as long ago as 1864, and highly esteemed by the author’s scientific countrymen, absolutely unknown to a great number of English naturalists, including some who have occupied themselves more or less specially with the subjects of which it treats. It possesses a value quite independent of its reference to Darwinism, due to the number of highly interesting and important facts in the natural history and particularly the developmental history of the Crustacea, which its distinguished author, himself an unwearied and original investigator of these matters, has brought together in it. To a considerable section of English naturalists the tone adopted by the author in speaking of one of the greatest of their number will be a source of much gratification.