Chap, ii.] OF MOVEMENTS IN THE VEGETAL KINGDOM. 347 



than vegetal ; nevertheless it exists in a large number of 

 vegetals, if the facts observed by Goeppert are exact. According 

 to what this observer saya, branches cut from plants rich in 

 milky juices {G/ielidonium majus, Zactuca perennis, Euphorbia esula, 

 &c.) no longer pour forth liquids when plunged into prussic acid. 

 Here then we have a property common to the two kingdoms, 

 which, moreover, touch at many other points. The manner in 

 which the spores and the antherozoids of the cryptogams move, 

 forms a new feature of union. Here is no longer analogy, but 

 identity. We know that many infusoria alter their position by 

 means of vibrations, oscillations of one or many filiform ap- 

 pendages called idbratile cilia, which are also found in animals on 

 a variety of epithelial cells, hence called vihratile epithelium. 

 Now these animal vibratile cilia in no wise differ from those 

 which serve as propulsive agents to the spores and antherozoaries 

 of sea-weeda and of certain mushrooms, &c. Our classifications, 

 with their arbitrary divisions, are never the exact expression of 

 nature. Everything is connected ; everywhere there are transi- 

 tions and shadings. 



