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First of all, going back to the last of the above generalizationswe will try to examine more precisely, how is this transition from a homogeneousto dissimilar. Used to say that this is bysuccessive differentiations. But, as we understand the matter, it is notrepresents the full description of the process. During the development of the bodyhappens is known to every physiologist, not only separation of the parts, butand drain them. There occurs not only a separation of parts, but the aggregation of them.Heart, at first wide, long beating blood vessel, little by littleshrinks and integrates. Gall-cells constituting the rudimentaryliver, not only separated from the surface of the intestines, where they firstlie, but simultaneously merge in a specific organ. And gradualconcentration, notice in these and other cases, is part of the processdevelopment - the part which, although investigated to a greater or lesser extentMilne-Edwards and others were not seems to be included as an essentialelement in the concept of the development process. This coherent integration, seems to be similar in differentstages traversed by each embryo, and the ascent from the lowerorganic forms to the higher, more convenient to study under several headings.We first consider what is called longitudinal integration.
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