806 



NATURAL SCIENCE 



[November 



have very different fates. They may (1) settle down within the 

 wall of the parent cell, and grow out into filaments, which finally 

 rupture the parent cell-wall by their elongation ; or (2) they may 

 escape, and only after swimming about for a short time settle down 

 to grow into filaments ; or (3) they may pair first of all, and then 



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the coupled-cell, after a rest, makes a fresh start of life and growth 

 and multiplication within the cell-wall. The life-cycle may be very 

 complex. We may even find states in which the cell- walls of the 

 filament gelatinise, and the cells themselves round off, the colony 

 forming a very irregular mass. 



