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 "l     Comparison with results of Pietenpol 74 
    Results of von Aufsess and Erikson 76 
 Section 4. Absorption curves from typical lakes 78 
    Settled waters. Devils and Little Papoose lakes 79 
    Filtration. Waters that filter to color 0 81 
    Filtration. Waters of color 6 83 
    Filtration. Groups I and II compared 85 
    Filtration. Waters of Group I 88 
    Filtration. Waters of Group II 90 
    Dilutions 93 
    Absorption at 3650 A 95 
 General tables of percentile absorption 99 
    Settled waters. Table X 100 
    Filtered waters. Table XI 103 
    Dilutions. Table XII 107 
CHAPTER IV. Analysis of absorption of light by lake waters 110 
   Types of curves 111 
 Section 1. Remainder curves 112 
 Section 2. General factor curves 114 
 2-component analysis 114 
 Single waters 116 
    Marl Lake 116 
    Horsehead Lake 118 
 Dilutions 119 
    Little Long Lake 119 
    Helmet Lake 120 
 Factor curves, 7,000-8,000 A 121 
 Section 3. Suspensoid curves 123 
 3-component analysis 123 
    Methods 123 
    Nagawicka Lake. Factor curves 125 
    Nagawicka Lake. Additive curves 128 
 Single waters. 3-component 130 
    Crystal Lake. Color 0 130 
    Mean colors 4, 6, 10, 20 131 
    Muskellunge and Marl lakes 133 
    Lake George. Color 24 136 
    Adelaide Lake. Color 28 137 
    Rudolf Lake. Color 50 138 
    Helmet Lake. Color 236 140 
 Use of mean color curve 142 
 Two waters of same color 143 
 Dissolved and colloid colors 144 
 Mean curves for color absorption; 0-180 145 
    Mean color transmission; 7 wave-lengths 146 
SUMMARIES 148 
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