. Eighth International congress of applied chemistry : Washington and New York, September 4 to 13, 1912 ... -- . at two dif-ferent temperatures are given below, as examples. (See TableV and fig. 4.) XX Vl] Congress of Applied Chemistry 177 TABLE V. (H. C. 1910., Table XII)Disinfection of B. coli commune with hot water. Exp. I, 15. 2. 10. Temperature °C. Time,minutes= t Amount ofsampletaken,drops Numberscountedon plates(agar) Mean Mean no. ofbacteria presentin 1 dropdisinfectionmixture, =iV LogioiV K =1 tn-UNol°*Nn = Z„ 2 46 1015 20 ? 111 f 12 ? 11 22 I 5 10 10 ,20 371 362 383266 2
. Eighth International congress of applied chemistry : Washington and New York, September 4 to 13, 1912 ... -- . at two dif-ferent temperatures are given below, as examples. (See TableV and fig. 4.) XX Vl] Congress of Applied Chemistry 177 TABLE V. (H. C. 1910., Table XII)Disinfection of B. coli commune with hot water. Exp. I, 15. 2. 10. Temperature °C. Time,minutes= t Amount ofsampletaken,drops Numberscountedon plates(agar) Mean Mean no. ofbacteria presentin 1 dropdisinfectionmixture, =iV LogioiV K =1 tn-UNol°*Nn = Z„ 2 46 1015 20 ? 111 f 12 ? 11 22 I 5 10 10 ,20 371 362 383266 253 304191 178 20168 76129254416 29671015 181 610 372 190 372 = No 190 £ . . Mean . 172 Exp. II, 15. 2. 10. Temperature °C. = *o 2 4 6 810 111 2 {= 1010 416 331 402207 235 18393 73 10321 47 194 3 56 51 0 1 383208 29 =) 383=^0208 . .041 . .442 . Mean .381 178 Original Communications: Eighth International [ Time, minutes Fig. 4. Disinfection of B. coli commune with hot water (Table V).(a) Exp. I at °C. (6) Exp. II at °C. Disinfectant Action of Sunlight and Drying Drying. Paul & Prall (1907) while investigating the suitabilityof the garnet method for disinfection experiments withstaphylococcus, allowed garnets, coated with a thin dry filmof bacteria to remain at various temperatures and counted thesurviving bacteria from time to time. It was found that whilethe number of living organisms remained constant for manyweeks at the temperature of liquid air, the numbers slowlydecreased at ordinary temperatures. Paul (1909) has analysedthe above data and has shown that death by drying also proceedsin accordance with a logarithmic law. (See also Paul, Birstein& Reuss, 1910.) Sunlight. There are only very scanty experimental dataupon this subject, but in the work of Clark & Gage (
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