FIGURES 



Section Page 



5 Number of fry produced per 100 grams of female fathead 



minnow in HCN 42 



5 Number of fertilized eggs produced per female brook trout 



in HCN 48 



5 Growth of brook trout in various concentrations of HCN . . 50 



6 The scheme of microbiological indices of water quality . . 56 



6 Scheme of the order of test tubes in determination of 



living bacteria by titer method 58 



6 Position of the test-tube (N 2) with ethyl alcohol in 

 the row when determining the spores of bacteria in mud 

 deposits 61 



6 Effect of Ag ions on bacteria. Analysis using the hetero- 

 trophic assimilation of CO2 70 



6 Determination of the reserves of phenol in the water of 



the Kanskoe Reservoir by the method of Right and Hobbit . . 71 



9 Hydroxylative enzyme systems in liver and bone that 



require vitamin C 98 



12 Changes in the conditioned reflex activity in the common 

 guppy {LzblbtzA finticu.la.tiiA) under the influence of sub- 

 lethal concentrations of phenol 124 



12 Symptoms of intoxication of medicine leech in solutions 

 of polychlorpinene (1-4), chlorophos (5-8), and phenol 

 (9-12) 126 



14 Correlation between Woodiwiss' biotic index and BOD5 . . . 145 



14 Correlation between Woodiwiss' biotic index and bi- 

 chromate oxygen consumption 146 



VI 



