. The causes and course of organic evolution; . the middle-body substance; in the origin of amouth, at times of a protrusible pharynx, of an alimentarycanal, and of an anus; in the polar actions and reactions shownby both; as well as minuter details that cannot here be exam-ined, both show an exact fundamental agreement. As the embryological studies by Zelinka and the maturestudies of the Rotifera by many observers show, the demarca-tion of the individual cells of the Rotifera is faint, and becomesincreasingly so as one passes from the early to the late embryo, 416 Causes and Course of Organic
. The causes and course of organic evolution; . the middle-body substance; in the origin of amouth, at times of a protrusible pharynx, of an alimentarycanal, and of an anus; in the polar actions and reactions shownby both; as well as minuter details that cannot here be exam-ined, both show an exact fundamental agreement. As the embryological studies by Zelinka and the maturestudies of the Rotifera by many observers show, the demarca-tion of the individual cells of the Rotifera is faint, and becomesincreasingly so as one passes from the early to the late embryo, 416 Causes and Course of Organic Evolution and then to the adult. But the Hnes of stereoenergesis inthe Rotifera remain fundamentally as in ciliate such is true, however, the writer is deeply sensible thatno single organism now exists which would readily bridge overthe highest existing infusor with the simplest rotifer. But thisis not surprising when we bear in mind the wide and deep or-ganic gaps which exist all along the biologic scale. ^ me. :. %.
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