. Bulletin. Agriculture. 66 MISCELLANEOUS PAPEKS. Table XXV.âToxicity of copper sulfate to Bacillus coli in tap irater free of carbon dioxid.' 1 part copper sulfate toâ Duration of exposure to action of copper j Qj^gâ^ I jq qqq â ^^^^^^^' j â I parts of water. 0 2 hours. 6 hours. 24 hours Colonies. 4,600 1,450 1,500 250 Colonies. 1,SOO 0 0 0 50,0C0 1 100,000 parts of ^ parts of water. Colonies. 4,800 0 0 0 water. Colonies. 3,700 20 0 0 500,000 parts of water. Colonies. 4,.500 80 5 0 1,000,000 I)arts of water. Colonies. 4,000 100 2 0 1 Experiment conducted in Weber resistance glass test
. Bulletin. Agriculture. 66 MISCELLANEOUS PAPEKS. Table XXV.âToxicity of copper sulfate to Bacillus coli in tap irater free of carbon dioxid.' 1 part copper sulfate toâ Duration of exposure to action of copper j Qj^gâ^ I jq qqq â ^^^^^^^' j â I parts of water. 0 2 hours. 6 hours. 24 hours Colonies. 4,600 1,450 1,500 250 Colonies. 1,SOO 0 0 0 50,0C0 1 100,000 parts of ^ parts of water. Colonies. 4,800 0 0 0 water. Colonies. 3,700 20 0 0 500,000 parts of water. Colonies. 4,.500 80 5 0 1,000,000 I)arts of water. Colonies. 4,000 100 2 0 1 Experiment conducted in Weber resistance glass test tubes, each containing 10 c. c. of Potomac tap water, portions of Miiich had been treated previously with the desired amount of copper sulfate. All tubes inoculated with a 2 mm. loop of culture of Baei/lim eoli. received from Prof. Theobald Smith. The temperature during this experiment varied from 18"^ to 22° C. Table XXVI.âEffect of carbon dioxid upon toxicity of copper sulfate to Bacillus coli.^ Duration of exposure to action of copper sulfate. 1 Check. 1 part copper sulfate to- 1 Colonies. 0 hour 4,200 2 hours ' 6 hours ], 460 24 hours 1, 540 10,000 parts of water. 50,000 parts of water. Colonies. "4,000 10 15 0 Colonies. 9,800 0 15 0 100,000 parts of water. Colonies. 1,270 0 20 0 500,000 parts of water. Colonies. 5,100 110 10 0 ,000 parts of water. Colonies. 1,100 260 35 0. Table XXVII.âEffect of carbon dioxid upon toxicity of copper sulfate to Bacillus coli.'^ Check. 1 part coppi T sulfate toâ Duration of exposure to action of copper sulfate. 10,000 parts of water. 50,000. parts of water. 100,000 parts of water. 500,000 parts of water. ,000 parts of water. 0 hour Colonies. 3,800 2,300 1,600 3,500 Colonies. 3,000 0 10 0 Colonics. 8,500 5 12 0 Colonies. 5,200 15 10 10 Colonies. 4,400 2,150 120 35 Colon ies. 5, 500 2 hours 1 500 6 hours 100 24 hours ' 0 1 Experiment conducted in Weber resistance glass tubes, each containing 10 c. c.
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