. The doctrine of descent and Darwinism. Evolution. 250 THE DOCTRINE OF DESCENT. vision assumed, the value of the hypothesis is undimin- ished. It was the road to truth. In our science Haeckel has made the most extensive use of the right of devising hypothetical pedigrees as landmarks for research. It matters nothing that he has repeatedly been obliged to correct himself, or that others have frequently corrected him; the influence of these pedigrees on the progress of the zoology of Descent is manifest to all who survey the field of science, not to mention that in the last ten years a series o
. The doctrine of descent and Darwinism. Evolution. 250 THE DOCTRINE OF DESCENT. vision assumed, the value of the hypothesis is undimin- ished. It was the road to truth. In our science Haeckel has made the most extensive use of the right of devising hypothetical pedigrees as landmarks for research. It matters nothing that he has repeatedly been obliged to correct himself, or that others have frequently corrected him; the influence of these pedigrees on the progress of the zoology of Descent is manifest to all who survey the field of science, not to mention that in the last ten years a series of researches have conclusively fixed their results in good pedigrees. As we propose to give merely an introduction to the doctrine of Descent, we shall content ourselves with showing how the system or the pedigree is constituted in its application to the single group of the Vertebrata. Mammals. Birds. I Reptiles. Amniota. ? Primordial Vertebrata. I Annulosa. As we have seen above, the most important indica- tions of the pedigree of the species are contained in the. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Schmidt, Dr. (Eduard Oskar), 1823-1886. New York, Appleton
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