H/EMATOCOCCUS. 



A. KESTING STAGE.* 



Mount on a slide some sediment containing hcema- 

 tococcus that has been soaked for a feiv hours 

 in water. Cover and examine with a low power. 

 Find : 



I. External Characters. 



1. Red or green spherical cells. 

 With a high power observe : 



2. Size. (Measure.) 



3. Form. 



4. Color : red, green, or in some cells both red 



and green. 



II. Structure. 



1. Colorless cell-wall. 



2. Cell-contents: more or less granular; con- 



sisting of protoplasm, a centrally situated 

 nucleus and superficial chromatophores in 

 which the coloring matter is deposited. 

 (The outlines of the chromatophores are 

 difficult to distinguish in the living state. 

 The nucleus is more easily seen in the 



* Haematococcus can sometimes- be found in old marble urns. 

 When once obtained the same supply will last for a number of 

 years. It should be wet each year with spring-water, and is be- 

 lieved to flourish better if a little powdered marble is added. 



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