“The former conviction that these two kingdoms were wholly different in structure, in function, and in kind of life, was not seriously disturbed by the difficulties which the naturalist encountered when he undertook to define them.” KindTwoDifferentFunctionDifficultyStructureConvictionKingdomsFormerDisturbedNaturalist Book:Natural Science and Religion: Two Lectures Delivered to the Theological School of Yale College Source: Natural Science and Religion: Two Lectures Delivered to the Theological School of Yale College
“The best opinion now is, that there are multitudinous forms which are not sufficiently differentiated to be distinctively either plant or animal, while, as respects ordinary plants and animals, the difficulty of laying down a definition has become far greater than ever before.” FormAnimalOpinionGreaterOrdinaryDifficultyPlantDefinitionsPlants And AnimalsLaying Down Book:Natural Science and Religion Source: Natural Science and Religion
“Your candor is worth everything to your cause. It is refreshing to find a person with a new theory who frankly confesses that he finds difficulties, insurmountable, at least for the present.” PersonsCausesTheoryDifficultyRefreshingCandorInsurmountable Book:Letters of Asa Gray Source: Letters of Asa Gray
