Cytology and Movements of the Cyanophycee 327 
outward will surround twice the number of cells as the pre- 
ceding one, as shown in Fig. 94. 
17. In Oscillaria the outer laminz are dissolved off by 
the water. In Nostoc they swell collectively into a jelly 
which is permanent, while in Lyngbya the jelly remains as it 
was deposited, in thin tough layers. 
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