350 BIOLOGY. 



1962. If the decomposition that is effected by an 

 inferior amount of polarization, does not happen rapidly 

 enough, for what has flowed thither, to disappear, during 

 its afflux, by evaporation or precipitation ; the rest of the 

 mucus which has obtained the air-polarity, is now repelled 

 by the respiratory vessels, because both have become 

 synonymous. 



1963. The oxydized superfluous mucus is at once, 

 however, attracted by the intestine, because they are not 

 synonymous. There consequently originates a vessel 

 in the mass of mucus or parenchyma, that has been 

 secreted between the intestine and skin, which begins in 

 the respiratory membrane and terminates in the intestine. 



1964. This vessel will commence at the end of the 

 absorbents, or at a point, where it devolves upon the 

 respiratory vessels, to take up their contents, namely 

 the oxygen, together with the nutritive substance, and 

 convey them to the intestine. The mucus, which pre- 

 viously stagnated and moved but slowly from one spot 

 to another, is now again carried back by another vessel 

 without interruption to the intestine. 



1965. The vessel which conveys oxydized mucus from 

 the respiratory to the intestinal system, is called artery. 



1966. On the intestine, however, this polar mucus is 

 again reduced to ordinary mucus. It has now become 

 synonymous with the intestine, is repelled from it and 

 attracted by the branchial membrane. 



1967. One and the same fluid or sap is consequently 

 brought back from the branchia to the intestine, and 

 from thence again to the branchia. This last vessel is 

 called vein. 



a. Arteries. 



1968. The artery is, according to its signification, an 

 air-vessel, which is prolonged or elongated as far as the 

 intestine. Essentially, the artery conveys nothing but 

 air, though this is effected by means of a medium or 

 vehicle, which is the undecomposed mucus (blood). It 

 is an air-tube, that has been self-substantially dismem- 

 bered from the skin, in order to become a special inde- 



