440 THE BEGINNINGS OF LIFE. 



3. External Vesiculation leading to the Production of a 

 Brow Spherical Vesicle ivith a Nodulated Surface Nature 

 uncertain. Under circumstances similar to those last 

 mentioned, some specimens of Euglenae undergo de- 

 colourization, and produce a spherical outgrowth of their 

 own size, which rapidly becomes brown and nodulated 

 over its whole surface (). These bodies vary much as 

 regards the intensity of the brown colour and their 

 degree of opacity. They generally persist for a long 

 time without undergoing any change. A nucleus may 

 sometimes be recognized in their interior, and on 

 several occasions I have seen two or three delicate 

 filaments issuing from them as from a Fungus-sporan- 

 gium. Bodies of a similar nature are also frequently 

 produced from large Chlorococcus vesicles about T^W 

 in diameter. 



4. Direct Resolution into actively-swarming Monads. 

 This change has only been observed in a few samples 

 of Euglenae, though amongst one batch it took place 

 very frequently. The organisms which underwent the 

 change were motionless and more or less spheroidal in 

 shape, though not encysted. Some specimens were seen 

 whose whole contents had been resolved into a number 

 of minute motionless spherules, which were about 

 TOWS" * n diameter, partly of a pale green colour and 

 partly colourless. In other Euglense only a portion of 

 their substance had undergone this change the re- 

 maining parts presenting the ordinary green corpuscles 

 and red speck (o) . But in a third set, all trace of the 



