Contents 5 



PAGE 



Cyprinodontidae Killifishes 100 



Percopsidae Trout perches 100 



Serranidae Sea basses 100 



Percidae Perches 1 00 



Centrarchidae Sunfishes ;••■•■ 101 



Atherinidae Silversides 102 



Sciaenidae Drumfishes : 102 



Cottidae Sculpins 102 



Gasterosteidae Sticklebacks 102 



Gadidae Codfishes 102 



Section V. Chemical investigation of the Oswego watershed 108 



Types of pollution 108 



Methods employed HO 



The canals H° 



Stream studies 1 12 



Spring studies H^ 



Lake studies 1 1 ' 



Tabulation of data: 



Series I. Chemical analyses of streams 118-125 



Series II. Chemical analyses of springs 126 



Series III. Chemical analyses of lakes 127-132 



Section VI. Biological studies of polluted waters in the Oswego watershed 133 



Sewage pollution 133 



Milk pollution 135 



Paper mill and woolen mill wastes 135 



Oil pollution 133 



Cannery wastes 136 



Sulphur pollution 137 



Conclusion 137 



Tabulation of pollution studies 138 ; 139 



Section VII. Plankton studies of Cayuga, Seneca and Oneida lakes 140 



Temperature of the water 141 



Transparency of the water 142 



Water analyses 143 



Quantitative determinations of plankton organisms 143 



Genera of plankton organisms 147 



Cayuga lake 147 



Seneca lake 150 



Oneida lake 151 



Estimations cf quantities of dry matter, organic matter and ash in the lake water. 154 

 Section VIII. Life history and economics of the lampreys of New York State. . . . 158 



Part I. Life history of lampreys 158 



Character and distribution of lampreys 158 



Coloration and distinction of sexes 159 



The three or four kinds of lampreys in New York 161 



Nest-building and egg-laying 165 



Number of eggs laid by the different forms 168 



Death of lampreys after spawning 1 69 



Persistence of the notochord 170 



Development of the eggs and duration of larval life, transformation and 



buccal glands 174-177 



Brook lampreys not parasitic 178 



Summary of the life history of lampreys 180 



Part II. Economics of lampreys 181 



Economics of larval lampreys 181 



Economics of the brook lamprey 181 



Economics of the sea lamprey 182 



Economics of the lake lamprey 182 



Experiments on the predatory habits of lampreys 184 



Amount of damage done to food-fish by lampreys 188 



Ridding a lake of lampreys 190 



Summary of the economics of lampreys 191 



