70 AGRICULTURE. 



reaction, especially when the maximum temperature goes above 

 104 deg. F, 



Precaution. — Water before beginning the temperature readings 

 the first day of the test; on the second day give a small quantity 

 (a pailful or so) in barn, if necessary, and turn stock out in the 

 afternoon for further watering. Large quantities of cold water 

 reduce the temperature, and if animals are watered at the usual 

 time in the morning on the day following the injection, marked 

 errors may be caused in the test. (Wis. Exp. Station.) 



lilST OF DISINFECTANTS. 



(Sternberg.) 



The most useful agents for the destruction of spore- 

 containing infectious material are: 



1. Fire. — Comi)lete destruction by burning. 



2. Steam under Pressure, 105^ C. (221° F.,) for ten minutes. 



3. Boiling in Water for half an hour. 



4. Cklorid of Lime (should contain at least 25 per cent of 

 available chlorin). — A 4 per cent solution. 



5. Mercuric Chlorid. — A solution of 1-500. 



For the destruction of infectious material which owes 

 its infecting power to the presence of micro-organisms not 

 containing spores, any of the following agents are recom- 

 mended: 



1. Fire. — Complete destruction by burning. 



2. Boiling in 7vater for ten minutes. 



3. Dry Heat, no" C. (230° F.), for two hours. 



4. Chlorid of Lime. — A 2 per cent solution. 



5. Solution of Chlorinated Soda (should contain at least 

 3 per cent of available chlorin). — A 10 per cent solution. 



6. Mercuric Chlorid. — A solution of 1-2000. 



7. Carbolic Arid. — A 5 per cent solution. 



8. Sulfate of Copper. — A 5 per cent solution. 



9. Chlorid of Zinc. — A 10 per cent solution. 



10. Sulfur Dioxid (this will require the combustion of 

 betw^een 3 and 4 lbs. of sulfur for every 1000 cubic feet 

 of air-space). — Exposure for twelve hours to an atmos- 

 phere containing at least 4 volumes per cent of this gas, in 

 presence of moisture. 



