Studies in the Theory of Descent, Том 2

according action adaptation Amblystoma Amblystoma form Amphibia antennæ appear Author Axolotl become butterflies caterpillar causes centim certainly characters Charocampa cloth extra colour completely constant Crown 8vo Darwin Deilephila demy 8vo depends dimorphic Diptera direction divergence dorsal Duméril Edition essay Eueides Eueides Isabella existence explained extent external influences eye-spots fact families form-divergence form-relationship genera genus gilt edges green Hartmann heredity Hymenoptera imagines imago incongruence individual insects lake large number larva larvæ last stage latter Lepidoptera manner marking mechanical metamorphosis morphological Natural length natural selection numerous Illustrations Nymphalideous occur ontogeny organism perennibranchiate period phenomena phyletic development phyletic vital force phytophagic possess present pupa pupæ R. D. BLACKMORE reproduction result reversion ring-spots salamander Sampson Low segments shown Siredon Small post 8vo species specimens Sphingida spines spots stomas structure sub-order subdorsal line systematic groups tion transformation Triton unequal Vanessa variability variations varieties whilst whole