84 DROPS OF WATER. 



body of this minute creature, some green Monads 

 which it had eaten, and by which it was proved 

 not to be herbivorous. With a magnifying power 

 of 800, eggs may be discerned. The genus 

 Polt/toma abounds in water where animal matter 

 is found. It has a double whip-shaped pro- 

 boscis ; as the body increases in size, it has a 

 wrinkled appearance, and at last self-divides into 

 numerous individuals. Polytoma uvella is the 

 only species : it is colourless and of an oblong 

 form. Microglena is characterized as being the 

 first to possess an eye in other respects it re- 

 sembles the Monad: it is found amongst slimy 

 water-plants. A great portion of the green 

 matter found on stagnant water is formed by in- 

 dividuals of the genus Glenomorum ; they cluster 



