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abundant algae amorphous matter Anabaena animal Animalcules aquatic Asterionella attached bacteria Basin Boston Water bottom branched Bryozoa cause cell-wall cells chemical Chlorophyceae chlorophyll cilia Ciliary wreath circulation color colorless common contain contractile Crenothrix Crustacea cubic centimeters curve Cyanophyceae cylindrical depth diameter Diatomaceae diatoms distribution error Fam1ly filaments filtered filtration flagella flagellum forms free-swimming fresh-water sponge Frustules funnel gelatinous genera girdle view globose gonidia ground-water growths heterocysts hyphae inch Infusoria isms Lake Cochituate large numbers layer length light lorica mass microscopic organisms microscopical examination nodules number of organisms observed odor organic matter organisms found pipes plankton plants PLATE ponds Propagation protoplasm Protozoa raphe Rept reservoir Rotifera sand season sheath shell sometimes species spherical spicules spines spores spring square stagnation standard unit Statoblasts stopper supply surface surface-water Synura Tabellaria takes place tegument temperature thermocline tion transverse trichomes tube usually vacuole valve view varies vegetable vertical water-supplies zoospores zygospore
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