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Here begins a further series of changes, which we still findthe corresponding phenomenon in the individual body. Returning again toHydrozoa, we observe that in the simplest of complex forms between their associatedthemselves individuals, evolved from one common original body, the samein their structure and have the same departure from that, however, the differencesometimes the kidney, instead of developing, to form a stomach, mouth, andtentacles, forming an egg pouch. But this does oceanic Hydrozoadoes not happen. In Calycophoridae some of the polyps arising from a commonof the embryo develop and differentiate, are transformed into large, oblong,saccular body that move in water by rhythmiccuts, dragging behind him the whole community of polyps In Physophoridae varietybodies formed in the same order through the transformation from developingkidney polyps, so that in animals, similar bubble (Physalia), istree group an indivisible component of the primitive type of this category, wesee the complex mass of disparate parts, correcting uneven features.As each individual Hydra can be considered a simple group, partlyturned into various organs, in the same way and bubble,morphologically considered, represent a group of hydras, some individualswhich has undergone various transformations to adapt to differentfunctions. The same complex process of differentiation occurs in a gradualthe development of a civilized society. We know how the small primitivecommunities occurs some kind of simple political organizationa practical division of the estates, administering variousresponsibilities. Now we have to consider how in the nationformed by the fusion of several small communities, separate compositepart, being initially identical in their structure and occupation,gradually become different in both, gradually become mutuallythe dependent parts, and different substance, and itsshipments.
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