CHAPTER XXI. 



TRANSFORMATIONS OF EUGLENiE AND OTHER ORGANISMS'. 

 MODES OF ORIGIN OF CILIATED INFUSORIA. 



Crystals and Organisms. Variability of latter. Derivative Organisms. 

 Observations of Dr. Gros and of Author upon Euglen^. Their 

 Resolution into Fungus-germs and Monads. Resolution of other 

 Euglente into Diatoms and Algoid Corpuscles. Transformations 

 of entire Euglenae into Diatoms, Desmids, and Pediastrge. Trans- 

 formation of others into Confervae. Interchangeability of Algee 

 and Lichens. Relations of Algse to Mosses. Observations of 

 Dr. Gros and M. Brebisson. Community of Nature between 

 Algffi, Pediastreae, Desmids, and Diatoms. The latter form a 

 Divergent Series. Transformations of Euglenoe into Amoebae and 

 Actinophrys. Their subsequent Development into Ciliated Infu- 

 soria. Direct Transformations of Euglenoe into Ciliated Infusoria. 

 Variable Nature of resulting Forms. 



Other Modes of Origin of Ciliated Infusoria. Transformations of 

 Chlorococcus Vesicles into Oxytricha and Plaesconia. Similar 

 Mode of Origin of Vorticella. Development of latter also from 

 bud-like outgrowths, and from the 'pellicle.' Origin of other 

 Ciliated Infusoria from Monads and Amoebae. Testimony of 

 various Observers. Dependence of Forms upon the size of Trans- 

 forming Matrices. Observations of M. Nicolet upon Chara. Mode 

 of Origin of Otostoma within Nitella-filament. Origin of almost 

 similar forms of Infusoria from Animal Matrices. Pangenesis in 

 Rotifers. Their Resolution into Actinophrys, Peranemata, ana 

 Arcellinfe. Tendency of these Forms to give rise to Ciliata. 



