EFFECT OF COPPER UPON WATER HACTERIA. 63 



T.\BLE XIII. — Effect of copper sulfate upon Jlacillus guhlanatiis. 



Duration of exposure to action 

 of copper sulfate. 



hour 



2 hours .^ 



(■> hours 



24 hours 



Check. 



Colonies. 

 12,500 

 12, 000 

 12,500 

 40,000 



1 part copper sulfate to — 



10,000 



parts of 



water. 



25,000 I 50,000 

 parts of ! parts of 

 water. water. 



100,000 i 500,010 1,000,000 



parts of i parts of parts of 



water. I water. water. 



Table XIV. — Effect of copper sulfate npoii yTkrococcus radians. 



Duration of exposure to action 

 of copper sulfate. 



hour . 

 2 hours . 

 6 hours . 

 24 hours 



Check. 



Colonies. 

 1,200 

 1,200 

 1,400 

 1,900 



1 part copper sulfate to— 



10,000 



parts of 



water. 



25,000 



parts of 



water. 



50,000 



parts of 



water. 



Colonics. 



2,700 



1 











Colonies. 



10,500 















Colonies. 



1,700 



1 











1,000,000 

 parts of 

 water. 



Colonics. 



2, 800 



10 



1 







Tablk XV. — Effect of copper sulfate upon Pseudomonas radicicola [alfalfa). 



Duration of exposure to action 

 of copper sulfate. 



hour . . 

 2 hours . 

 6 hours . 

 24 hours 



Check. 



Colonies. 



270 



210 



220 



1, 175 



10, 000 



parts of 



water. 



Colonies. 



300 















1 part copper sulfate to — 



25, 000 



parts of 



water. 



Colonies. 



330 















50,000 

 parts of 

 water. 



Colonies. 



425 















100,000 

 parts of 

 water. 



Colonies. 



3,700 















500,000 



parts of 



water. 



Colonies. 



700 















1,000,000 

 parts of 

 water. 



Colonies. 



290 















Table ^\1.— Effect of copper sulfate upon Bacillus violaceus laurerdius. 



Table XYII. — Effect of copper sulfate upon Pseudomonas amethystina. 



100— VII 



