INDEX 



Alumina, 53, 128 

 Amoeba, number, 84 

 Anabaena, analysis of, 159, 215 



number of, 136 

 Anisoptera, analysis of, 174, 215 

 Ankistrodesmus, analysis of, 161, 215 

 Annual cycle, 1 



of plankton, 27, 30, 69, 105, 113, 126, 

 130 

 Anuraea, number of, 129 

 Aphanizomenon, analysis of, 159, 215 

 Aphanocapsa, distribution of, 85 



number of, 85, 119, 136 

 Apparatus, 9 



Ap stein, on ash determinations, 54 

 Ash, amount of, 150 



of nannoplankton, 80, 83, 117, 135 



of net plankton, 45, 52, 109, 128 



of various organisms, 179 

 Asplanchna, weight of, 155 



Bacteria, role of, 88 

 Bradley, 53 



Brandt, 55, 162, 164, 167, 178 

 Bureau of Fisheries, U. S., ix. 



Calcium, 54, 128 



Cambarus, analysis of, 171, 215 



Carbohydrates, 42 



Carbon dioxide, 2 



Centrifuge, 12 



bowl of, 14 



effect of, 64 



efficiency of, 14 

 Ceratium, analysis of, 162 



number of, 56, 129 

 Chironomus, analysis of, 174, 215 

 Chlorochromonas, number of, 85, 135 

 Chydorus, number of, 129 

 Ciliate, anaerobic, 22 

 Circulation of water, 2 

 Cladophora, analysis of, 162, 215 

 Clarke and Salkover, 179 

 Constants of ether extract, 168 

 Corethra, analysis of, 174, 215 

 Crude fiber, defined, 43 



in nannoplankton, 79, 117, 134 



in net plankton, 108, 127 

 Crude protein, 5 



in nannoplankton, 74, 114, 132 



in net plankton, 32, 35, 107, 126, 139 



ratio to organic matter, 115 

 Crustacea, economic importance, 154 



food for, 155 

 Cryptomonas, number of, 85, 136 



Curve, spherical, 58 

 Cyclops, analysis of, 166, 215 



number of, 129 



weight of, 155 



Daphnia, analysis of, 168, 170, 215 



number of, 111, 129 



weight of, 155 

 Determinations, chemical, number, viii 

 Diaptomus, analysis of, 166, 215 



number of, 129 



weight of, 155 

 Diatoms, analysis of, 163, 215 

 Discussion of results, 150 

 Dissolved oxygen, 2, 3, 20, 22, 156 



Ephemera, analysis of, 174, 215 



Epilimnion, 1, 3, 20, 22, 156 



Ether extract, 16 



in nannoplankton, 75, 116, 134 

 in net plankton, 40, 107, 127, 140 



Eurytemora, analysis of, 167 



Food and feeders, 4, 155 

 Food for planktonts, 155 

 Food relations, 4, 155 

 Fragilaria, number of, 56, 111 



Grasshoppers, analysis of, 176 

 Gyrinidae, analysis of, 175, 215 

 Hemiptera, analysis of, 176, 215 



Hensen, 7, 8, 55 



Hirudinea, analysis of, 173, 215 

 Holopedium, analysis of, 170, 215 

 Hyalella, analysis of, 172, 215 

 Hyams and Richards, 161 

 Hypolimnion, 1, 3, 22, 156 



Iron, 53, 128 



June bugs, analysis of, 176 



Laboratory, sketch of, 13 

 Lachnosterna, analysis of, 176 

 Leeches, analysis of, 173 

 Leptodora, analysis of, 171, 215 

 Lifetime of organisms, 153, 156 

 Limnocalanus, analysis of, 166, 215 

 Lohmann, 9, 10, 58, 62, 90 

 Lyngbya, analysis of, 159, 215 



