ABSTRACTS 



457 



grams of calcium carbonate are dissolved in the order named in 1000 

 cc. of hot water (about 80°C.). , 



The three solutions, A, B and C are mixed and 87.5 grams saccharose 

 and 12.5 grams of mannite are added. The resulting 5 litres of medium 

 are filled into ounce and a half wide mouth Blake bottles, plugged with 

 cotton. These bottles when filled are sterilised in the autoclave at a 

 pressure not exceeding 10 pounds. On removal, the bottles are sloped, 

 and inoculated by means of a pipette. About 2 cc. of a suspension 

 of the desired organism is run into each bottle. The bottles are kept 

 in a sloped position, and incubated at 25°C. for about a week, when 

 they are ready for distribution. — W. S. 



BACTERIOLOGY OF WATER AND SEWAGE 



Experiences in the Application of the Activated Sludge Process to Chicago 

 Stockyard Sewage. Arthur Ledbrer. Eng. Contrg., 45, 388. 

 The temperature of the hquid affects the action m winter. The 

 turbidity removal is an index of degree of treatment, and with the rela- 

 tive stabiUty test aids in control. — L. P. 



Winter Experience with the Activated Sludge Process at Milwaukee. 



W. R. CoPELAND. Eng. Contrg., 45, 386-387. 



In winter with a sewage averaging 10.5°C. (minimum 4.5 C.) the 

 oxidation was retarded. Two and one-fourth cubic feet air per gallon 

 removed 90 per cent of bacteria and reduced the suspended matter to 

 15 parts per miUion. The sludge contained 5 per cent N as NH3 and 

 could be readily pressed. Analytical details are given.— L. P. 



Grease and Fertilizer Base from Boston Sewage. R. S. Weston. Jour. 

 Am. Pub. Health Assn., 1916; 6, 334-343; Eng. News, 1916, 75, 913 

 The use of SO2 or H2SO4 on Boston sewage disinfects the liquid and 

 precipitates most of the grease with the greater part of the suspended 

 matter. Experiments showed a recovery of 1738 pounds dry sludge 

 per million gallons containing 21.7 per cent grease. The estimates 

 show an apparent profit of $6 per million gallons. Further investiga- 

 tion is recommended. — L. P. 



The Sterilization of Chicago's Water Supply. Eng. Contrg., 1916, 



45, 18. , . „ , n • . , 



After 5 years trial, hquid CI plants are to be installed on all intake 

 Imes. With less danger of tastes and odors, liquid CI is cheaper, more 

 flexible and capable of more precise control and reUabihty than other 

 disinfectants. — L. P. 



Manjland Experiences in the Disinfection of Water Supplies. R. B. 

 Morse. Eng. Contrg., 45, 396-397. ., , , ^, ^ ^ , 



From 2 to 3.0 parts per million of available CI have been used 



in hypochlorite plants and 0.25 to 0.67 in liquid CI plants. Fewer 



