PHYTOGENY. 215 



less rich in sap than the liber around the tracheal fasci- 

 culi, because it is too rapidly evaporated and dried 

 up by the immediate contact of the air, light and 

 heat. The surface of the plant is too strongly oxydized 

 by the air, and therefore the cells harden. The sap also 

 decomposes too rapidly and becomes rigid, so that an 

 irregular formation only can proceed from it. The ex- 

 ternal, more inactive, or irregularly wood-converted layer 

 of cells, is the Bark. 



1085. The plant has thus likewise three anatomical 

 systems, which are nothing new, but only the repetition 

 or rather vagination of the three tissues ; alburnum and 

 cambium are only transitional, not special formations. 



in. Organs of the Vegetable Trunk. Members. 



1086. Organs are separated parts of the body, and 

 combinations of single tissues and systems, and are con- 

 sequently a Whole in Singulars. There are, however, no 

 uniform combinations ; but one or the other system 

 asserts its preponderance and imparts the character. 



1087. In conformity with the developmental progress 

 of the whole of nature, namely, that of always separating 

 further its chaotically mingled parts, individualizing and 

 yet forming them with the others into a whole, vegetation 

 cannot continue stationary with the partition into bark, 

 liber and wood, seeing that they are always circumscribed 

 and form a body in common ; but they must also sever 

 this body itself into as many members as it has con- 

 stituent parts. This severance makes its appearance in 

 the longitudinal axis, because in this direction the anta- 

 gonisms of air and light with water and earth are more 

 powerful. 



1088. Through the separation of the vegetable trunk 

 three members only can originate ; one with the prepon- 

 derance of cells or of bark, one with that of vessels or of 

 liber, and one with that of the trachea? or of wood. The 

 cellular tissue has been posited as vegetable trunk in the 

 root, the vascular tissue as a special member is stalk, the 

 tracheal tissue leaf. In this manner the trunk of the 



