...sila, the series of notesproduced in any given call of a species of Smilisca is essentially the same;there is no differentiation into primary and secondary notes... 
William E. Duellman 「Neotropical Hylid Frogs, Genus Smilisca」
...Savage (MS) relied on the paleogeographic maps of Lloyd (1963) tohypothesize the extent and centers of differentiation of the Middle AmericanFaunal Element...
William E. Duellman 「Neotropical Hylid Frogs, Genus Smilisca」
...pacificus, and in addition the morphological differentiation was notso great...
James S. Findley 「Speciation of the Wandering Shrew」
...Thesefour barriers presumably have led to the differentiation of the twosubspecies that are newly named beyond...
Sydney Anderson 「Subspeciation in the Meadow Mouse, Microtus montanus, in Wyoming and Colorado」
...This area is themajor area of active differentiation...
Robert L. Packard 「Speciation and Evolution of the Pygmy Mice, Genus Baiomys」
...Moy-Thomas(1935:40; 1937:385) realized that the type of scale is a poor criterionfor specific differentiation...
Joan Echols 「A New Genus of Pennsylvania Fish (Crossoperygii, Coelacanthiformes) from Kansas」
...These featuresare of great importance not only as regards conception itself, but for thedevelopment of the organic form, and especially for the differentiation of thesexes...
Ernst Haeckel 「The Evolution of Man」
...Frequently this differentiation of the cell-formssets in at a very early stage, during the segmentation-process, and is alreadyvery appreciable in the blastula...
Ernst Haeckel 「The Evolution of Man」
...We have a direct instance of thisearliest process of differentiation to-day in the ontogeny of many of the lowerProtists (such as the Gregarinæ)...
Ernst Haeckel 「The Evolution of Man」
...The mass and weight of the brain are much greater in modernmammals, and the differentiation of its various parts more important, than intheir extinct Tertiary ancestors...
Ernst Haeckel 「The Evolution of Man」
...The further development—the complicated differentiation andcomposition of the various parts—is a matter of detail...
Ernst Haeckel 「The Evolution of Man」
...260), and which was inherited from them by thereptiles on one side and the mammals on the other, was formed by gradualdegeneration and differentiation from the many-toed fish-fin (Fig...
Ernst Haeckel 「The Evolution of Man」
...But such a development of languages isnot differentiation in the sense in which this term is here used, andoften used in biology, but is analogous to multiplication as understoodin biology...
J. W. Powell 「On Limitations To The Use Of Some Anthropologic Data」
...Thetendency of a tired eye is to see less differentiation, and to harkback to a dull uniformity; so get in touch at once with the vitaldifferences while your eye is fresh and your vision keen...
Harold Speed 「The Practice and Science Of Drawing」
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