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I can proceed to examine my conception in concreto, and to cognize, either a priori or a posterio, what I find in the object of the conception. The former a priori cognition is rational-mathematical cognition by means of the construction of the conception; the latter a posteriori cognition is purely empirical cognition, which does not possess the attributes of necessity and universality.
In no case, however, are either the frontal or the temporal sulci the earliest. As a rule the occipito- parietal is the earlier of the two. At the latter part of this period, another sulcus, the "posterio- parietal," or "Fissure of Rolando" is developed, and it is followed, in the course of the sixth month, by the other principal sulci of the frontal, parietal, temporal and occipital lobes.
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