XII. A, 



Heise- Chloride of Lime 



27 



a concentration of chloride of lime of 1:1000 recorded in tables 28 and 29 

 ' * [but] * * * a similar marked decrease in available chlorine 

 could not be detected on repeating the experiments with the same concen- 

 tration. It should be pointed out that there are other small deviations from 

 the theoretical quantities of chlorine. 



The analytical data given in Table VI show clearly that at 

 certain concentrations the reaction is completely changed and 

 that the irregularities noted by Glaser were not due to experi- 

 mental error. 



Table VI. — Decomposition of chloride of lime in fresh sewage * {concen- 

 tration of chloride of lime expressed as milligrams of available chlorine). 



A. EFFECT WITH VARYING PERIODS OF DIGESTION. 



| 18.75 



7.40 

 7.17 



7.24 



1.14 

 1.24 

 1.37 



11.35 

 11.58 

 11.51 



8.06 

 12.95 

 13.20 

 13.25 



ft - -™ e " d - Ad H Left ~ s "" e " d 



2.93 



2.76 

 2.82 

 0.48 

 0.78 

 0.38 

 4. 11 

 3.55 

 4.03 



1.87 

 8.90 

 8.60 

 9.00 

 14.64 

 15.20 

 14.72 



1.17 

 2.34 

 4.69 

 7.03 

 9.38 

 11.71 

 14.09 

 16.43 

 18.75 

 21.1 

 23.4 

 25.8 

 28.1 

 37.5 



15. 



10.5 

 13.6 

 15.6 



17.4 



20.2 

 20.6 



21.7 



3 Sewage, 50 cubic centimeters ; temperature of digestion, 28° C. 

 " Time of digestion, forty-five minutes. 

 * Time of digestion, one hundred minutes. 

 d Time of digestion, eighteen hours. 



B. EFFECT WITH SEWAGE SAMPLES OF DIFFERENT AGES. 



Series 5. Fresh sewage. 



Series 6. Same sample, after 24 hours. 



2.20 

 4.40 



35.2 

 70.4 



0.07 

 0.47 

 0.95 



1.03 



1.73 

 3.45 

 8.56 

 15.9 

 19.4 



5.00 

 6.00 i 



40.0 

 50.0 







0.26 



0.42 



0.64 



1.10 



1.90 

 1.35 

 1.00 

 15.8 

 25.2 

 33.5 



3.90 

 4.80 



Per cent. 

 100 

 87 

 86 

 84 

 78 



