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PHILOSOPHICAL NOTES ON 



Fig. 39. Monad from Dallinger's "Minute Forms of Life," (a) commence- 

 ment of division into two cells, (c?) stage previous to final separation, 

 (6) and (c) intermediate stages. 



Now, with these figures before us, we may perhaps be able to 

 understand what I conceive to have been the genesis of the rhizome. 

 Each nucleus represents a growing point. Each pair of cilia 

 represents two hairs, or rudimentary leaves. In the nucleus and 

 the hairs we have the elements of a node, with leaves, or roots. 



If the reader will now use a little imagination and fancy that 

 this monad at the stage (c) is ever trying to split itself into two 

 independent parts, but never succeeding, he will picture to himself 

 a primitive rhizome, for each ceU or node would again try to 

 split itself into two, and fail, so that a series of cells with their cilia 

 will be strung together, the interspaces being the interiiodes of 

 this primitive rhizome. We would have eventually something of 

 the nature shown in the diagram, Fig. 40. 



Fig. 40. Diagram showing how a monad might develop into a primitive 

 rhizome, (a) the nucleated points, with the cilia developed into branches. 

 The spaces between the growing points remain as internodes. 



