ZOOGENY. 341 



the idea of the root, and becomes, by virtue of the in- 

 fluence of light and air, instead of an absorbent organ, 

 an organ rather of decomposition an evaporations 

 organ. 



1890. As a cyst the internal wall incloses the nutri- 

 tive matter, which originates from the mucus, and thus 

 from the organic water. The internal wall is therefore 

 constantly immersed in the water, and is consequently in 

 every respect a root. 



1891. As the animal is only developed in light, so 

 must the function of the root languish in the external 

 wall, and decay, because it is devoid of the earth, which 

 protects it from or against the light. This deficiency is 

 compensated for in another way, or by the formation of 

 a cavity, into which the media of nutrition enter, and 

 which is dark like the earth. 



1892. Internal and external wall stand also opposite 

 to each other, like water and air. The one is the water-, 

 the other the air- wall. 



1893. The nutritive matters are not decomposed upon 

 the internal wall by extraneous influences, but they 

 remain identical; ay, they become indifferent, because 

 they enter into darker and warmer water. 



1894. On the other hand such nutritive matters are 

 decomposed upon the external wall; and there here 

 therefore gradually originates, instead of the chemicalizing 

 root-process, the polarizing process of air. 



1895. In a perfect light-animal it is only the internal 

 wall that is chemicalizing ; the external has become 

 oxydizing. The internal is a rnucus-wall, but the ex- 

 ternal, on account of the decomposition of mucus, an 

 oxygen- wall. 



Division. 



1896. The more an animal has been exposed to the 

 air and light, by so much the greater is the antagonism 

 between its internal and external wall. In aquatic 

 animals the antagonism is at its minimum, because ex- 

 ternally and internally there is water ; both parietes are 



