ri 



386 



7'IIE BEGINNINGS OF LIFE. 



1 



M. Nicolet states that this form, resembling Dujar- 

 din's Trichomonas 'vaginalis^ speedily passes on to the 

 development of an Amoeba^ resembling that which was 

 named after Gleichen by Bory de Saint Vincent. After 

 its escape from the globule in which it was formed^ it 

 swims about for a time with the aid of its vibralile 

 cilia^ then fixes itself by means of its caudal filament^ 

 either to the surface of the plant or to the walls of the 

 vessel in which it is preserved^ where it continues to 

 oscillate^ owing to the continuous agitation of its cilia, 

 It soon begins to project amoeboid expansions^ which 

 are generally long and simple^ though after two or 

 three days it detaches itself from its pedicle, and swims 

 about for a time before again coming to a state of 



^ Its body then becomes quite spherical, whilst it 

 loses its locomotory cilia, and becomes bristled with 

 straight and slender rays, which give it the appearance 

 of an Actmophrys.^ This new form [m) often lasts less 

 than a day. ^ The rays then disappear by retraction, the 

 body flattens itself, becomes discoid, and soon protrudes 



r 



new expansions on all sides, though these are larger, less 

 regular, and resemble those of ArcelU. Shortly after- 

 wards the disc extends itself on one side into rounded 

 lobes, and an Amoeba is formed. For a time the more 

 granular substance, in which the vacuoles form, remains 

 agglomerated posteriorly; though later, the granules 

 diffuse themselves throughout the whole mass, and then 

 this Amoeba, named after Gleichen, has no longer any 

 characters by which to distinguish it from other Amcsb^. 



rest. 



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