Section Page 



15 Concentration of soluble reactive silicon in water over- 

 lying sediments stored without disturbance in a core 

 liner collected from Saginaw Bay, Lake Huron 217 



15 Relationship between the flux of Si from sediments and 

 the density of Chironomid larvae in a series of repli- 

 cate cores taken from Saginaw Bay, Lake Huron, on two 

 separate cruises in 1978 220 



15 Flux of dissolved silicon from a sediment core collected 



from northern Lake Huron before and after exposure to 



a sterilizing dose of gamma radiation 222 



16 LC50 vs. average fish weight for nitrite bioassays on 



rainbow trout ( Salmo gairdneri ) 232 



16 LC50 vs. average fish length for nitrite bioassays on 



rainbow trout ( Salmo gairdneri ) 233 



16 Toxicity curves showing effect of chloride on nitrite 



toxicity to rainbow trout ( Salmo gairdneri ) 234 



16 Effect of chloride on nitrite toxicity to rainbow trout 



( Salmo gairdneri ) 235 



16 LC50 (as NO2-N) vs. pH 237 



16 LC50 (as HNO2-N) vs. pH 238 



xm 



