1901.] 



NATURAL SCIENf'ES OF PHrLADELPHIA. 



599 



The condition of a dead cell is represented in fig. -S. Here the 

 protoplasm is contracted, and the starch granules are lumped 

 together in the centre of the cells, in striking contrast to the case 

 represented in fig. 1, 



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Microscopic examination further showed that green threads were 

 interspersed here and there among these white filaments ; one of 

 these is shown in fig. 4, the green color being indicated by shading. 

 I regret not having made the examination sooner, since it would 

 thea have been possible for me to say whether or not the green 

 color is newly acquired. It seems quite probable that some of the 



