Geologymakeshugedemandsupontime; andweregrettofindthatithasexhaustedours—thatwhatwemeantforthebriefestandmostgeneralsketchofsomegeologicalconsiderationsinfavorofDarwinshypothesishassoextendedastoleavenoroomforconsidering "thegreatfactsofcomparativeanatomyandzoology" withwhichDarwinstheory "verywellaccords," norforindicatinghow "itadmirablyservesforexplainingtheunityofcompositionofallorganisms, theexistenceofrepresentativeandrudimentaryorgans, andthenaturalserieswhichgeneraandspeciescompose." Sufficeittosaythatthesearetherealstrongholdsofthenewsystemonitstheoreticalside; thatitgoesfartowardexplainingboththephysiologicalandthestructuralgradationsandrelationsbetweenthetwokingdoms, andthearrangementofalltheirformsingroupssubordinatetogroups, allwithinafewgreattypes; thatitreadstheriddleofabortiveorgansandofmorphologicalconformity, ofwhichnoothertheoryhaseverofferedascientificexplanation, andsuppliesagroundforharmonizingthetwofundamentalideaswhichnaturalistsandphilosophersconceivetohaveruledtheorganicworld, thoughtheycouldnotreconcilethem; namely, AdaptationtoPurposeandConditionsofExistence, ; andthehypothesiswhichconsistentlydoessotherebysecuresagreatadvantage.
