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Reproductions in a box under glass, 40 x 25 cm. Early stages of fish, amphibian, reptile, bird, human. The upper row shows the remarkable morphological similarity of the vertebrate embryos in their early stages of development. In the lower row - especially in fish and amphibian - striking differentiations are already indicated. Embryos were selected which correspond to each other in their developmental stage, but do not have to be of the same age