CONTENTS. 



Page. 



Introduction 345 



Solubility of gases in water 345 



Respiratory processes and mechanism in fishes 346 



Symptoms and lesions of the gas disease in fishes 348 



Cause of the gas disease in fishes 351 



Possibility of infection by gas-producing l)acteria 351 



Abnormal gas content of water in which the disease occurs 351 



Influence on respiration of fishes 352 



Identity of gas in the blood vessels, external vesicles, and water 354 



Elimination of the disease by reducing gas content of water 355 



Roles of nitrogen and oxygen in causation of the disease 356 



Relation of gas disease to temperature and pressure 357 



Conclusions 360 



Supersaturation of natural waters 361 



Conditions at Erwin, Tenn 361 



Conditions at Nashua, N. H 363 



Exophthalmia or "pop-eye" 365 



The caisson disease analogy 367 



Other animals susceptible to gas disease 368 



Effect of supersaturated water upon eggs and fry 369 



Methods of preventing the gas disease 369 



Summary ■ 374 



Bibliography 375 



344 



