EFFECTS OF 8 AW DUST ON FISH LIFE 



43 



SESSIONAL PAPER No. 22a 



at a glance. With this end in view, two grams each of different kinds of sawdust were 

 placed in shallow circular dishes containing respectively, 300, 400, 500, 600, 700, 800, 

 900, 1,000, 1,200, 1,500 and 1,700 c.c. of fresh water. After soaking for about five hours 

 in each case, a minnow was placed in each of the dishes. The length of time each 

 animal lived was carefully noted, except in those cases where death occurred during 

 the night. The results are given in the following tables : — 



White Pine Sawdust. 



Weight 

 of 



Sawdust. 



Volume 

 Water c. c. 



Time Soaking. 



Time at which 



minnow 

 was immersed. 



Results. 



2 grams. 



300 



From 10 a.m. 



2.43 p.m. 



Lived about 9 miautes. 





400 











500 













600 







• 







700 







II II 







800 







II 10 minutes. 







900 







13 







1,000 







L5 







1,200 







20 







1,500 







29 







1,700 







29 





Ontario Eed Pine. 



2 grams. 



300 



10 a. m. 



2.47 p.m. 



Lived 47 minutes. 



400 





,1 50 





500 







„ 50 





600 





II 



II 1 hour and 28 minutes. 





700 







1 „ 14 



II 



800 







1 u 14 



II 



900 







1 11 53 





1000 







II 2 hours and 20 n 





1200 







2 „ 50 



II 



1500 







3 1, 45 





1700 







3 „ 45 



Ontario Cedar. 



2 grams. 



300 



From 10 a. m. 



2.33 p.m. 

 II 



Lived 8 minutes. 



400 





9 





500 







,1 19 



M 



600 * 







„ 20 



II 



700 





II 



1, 21 





800 





II 



u 22 





900 







II 27-11 ' 



II 



1000 







1, 27 





1200 







11 1 hour. 





1500 







II 1 II et 48 minutes. 





1700 







11 1 II et 55 ,1 



