DISINFECTANTS 109 



Preparation for Ivy Poison 



Mix 1 pound of buttermilk with 2 ounces of salt 

 or all that will dissolve. Apply to parts of skin 

 affected by poison ivy or similar skin diseases. 



A Method for Modifying Milk for Invalids 



Heat a given quantity of milk to 86 F. Add 

 sufficient rennet to coagulate in twenty minutes and 

 mix thoroughly. After precipitating the casein, filter 

 out whey and modify with proper per cent of casein 

 thus obtained to give the percentage of protein 

 (1.5 per cent) of human milk. 



Preserving Casein 



Precipitate casein of milk by use of sulphuric or 

 hydrochloric acid with which a small percentage of 

 borax or other preservative has been added in pro- 

 portion of J to 1 per cent of the preservative. Dry 

 and pulverize. Thus preserved the casein is unfit 

 for food, but may be used in the manufacture of glue 

 and paint. 



EXERCISE XXXI 

 DISINFECTANTS 



Prepare the following disinfectants: Solution of 

 corrosive sublimate (HgCl 2 ) 1 to 1000; carbolic acid, 

 C 6 H 5 OH, 1 to 20; formaldehyde (HCHO + H 2 0) 1 to 

 20. Apply to infected places and note results. Po- 

 tassium permanganate (KMnOJ 1 to 20, cold water; 



