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amphibia ancestors animals answer aorta appear Argyroneta arthropod assertion Basilosaurus believe birds bones Breeding Experiments Cambrian Chelonian Cretaceous Darwin Davies Dear Professor Haldane dentary descended developed Dewar direct evidence DOUGLAS DEWAR Drosophila melanogaster eggs embryo Eocene Evidence afforded Evolution Protest Movement Evolution Proved evolution theory evolutionists evolved example excreting existing Fabre fact forms fossil record genera genes genetic geneticists groups habit HALDANE Dear Professor highly specialised hind legs horses insect J. B. S. Haldane larvae letter lower jaw mammal-like reptiles mammalian mammals marsupials mice modern molluscs muscle nascent organs natural selection nest under water Nothosaurus orgies of variation Peckhams pelvis Permian phyla placentals Plesiosaurs postulate pre-Cambrian primitive produce quadruped sea-lion seals silk Simpson small mutations spiders spinnerets structures sub-orders supposed gradual transformation swimming tape-worm theory of evolution thousand million to-day uric acid vertebrates Volborthella wasps whales wild type worms Zeuglodon