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The doctrine of progressive division of labour to which we are come,
familiar to all readers. Further, the analogy between the economic division
labour and the "physiological division of labor" so striking that for a long time already
attracted the attention of naturalists and introduced into science the expression of it.
Therefore, there is no need to indulge in unnecessary details when
the study of this part of our subject. We will udovolstviem showing
several common and significant facts are not conspicuous when
a superficial consideration of the case.
Throughout the animal Kingdom, starting with the Coelenterata, the first phase of development
one and the same. In the Bud of a polyp, as in the human egg mass
of cells, of which has formed a living creature, ulagam
peripheral layer of cells, slightly razlicitih from other cells,
this layer is surrounded by, subsequently it is divided into two layers:
internal, being in touch with the yolk and are called mucous
layer, and an outer, exposed to surrounding influences and called serous
layer - or, in the words of Professor Huxley, used them when
the description of the process of the development of Hydrozoa, formed endoderma and ectoderma. It
primitive separation indicates the main difference of the parts in the future
the body From the mucous layer, or endoderm's, develops nutritional
the apparatus, while the serous layer, or ectoderm's developing apparatus
outside activities. From the first formed the bodies, which
the food is prepared and absorbed, oxygen is drawn and the blood is purified,
while the latter is formed of the nervous, muscular and skeletal systems
the United action which are movements of the body as a whole. Though
the definition is not strictly correct, as some authorities have in
its composition both main shell, but the high authority
agree that it can be taken as a General distinction.
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