Cytology and Movements of the Cyanophycem 327 



outward will surround twice the number of cells as the pre- 

 ceding one, as shown in Fig. 94. 



17. In Oscillaria the outer laminae 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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