. The analysis of food and drugs . Cladothrix dichotoma (6) under a low power. Confervce (7). — These are filiform algae,which are widely distributed in all ponds,rivers, and reservoirs, being especially abun-dant near the margins. They are character- y^istic of water comparatively poor in organic matter. „ Crenothrix (or Leptothrix) Kuhni-ana (8).—This organism is commonin running or stagnant water that isrich in organic matter. The threadsare motile, and in their younger stagesare grouped into little patches. Theyhave a greenish or brownish colour,and impart the same tint to the a r
. The analysis of food and drugs . Cladothrix dichotoma (6) under a low power. Confervce (7). — These are filiform algae,which are widely distributed in all ponds,rivers, and reservoirs, being especially abun-dant near the margins. They are character- y^istic of water comparatively poor in organic matter. „ Crenothrix (or Leptothrix) Kuhni-ana (8).—This organism is commonin running or stagnant water that isrich in organic matter. The threadsare motile, and in their younger stagesare grouped into little patches. Theyhave a greenish or brownish colour,and impart the same tint to the a reservoir is infected with them,large quantities of water may bedeteriorated in a short time. Theluxuriant growth of this organism atthe Berlin water-works proved sotroublesome that fresh filter - bedsIt developed to a thickness of Some feet. were constructed. 26 CHEMICAL AND BIOLOGICAL ANALYSIS OF WATER in the streams supplying the water-works, although theorganic matter dissolved in the water was small.
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