Crosby: OBSERVATIONS ON DICTYOSPIlvKlUA, OU 



younger plants they are formed against and within the pyrenoid 

 (PL XV., Fig. /p), from which they seem to have origin, and 

 from which they gradually move, until eventually the majority 

 lie beyond or against the pyrenoid. A small chromatophove 

 generally has from one to three starch grains a larger one five 

 to eight, or even more. 



Oil drops. — The large oil drops are scattered irregularly 

 throughout the endochrome, abundant in number. They are 

 differentiated from other protoplasmic structures by large size, 

 lighter color, regular outline, and stronger refraction. 



Cell sap. — The cell is entirely filled with a large amount 

 of watery colorless fluid, whose composition was not investi- 

 gated. 



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