966 



Rural School Leaflet. 



LESSON IN CLEAN MILK 



W. A. STOCKING, JR. 



The purpose of this exercise is to show the importance of cleanliness 

 in the handling of milk, and the value of a small topped milking-pail 

 in increasing its keeping quality. 



Materials Needed. — Two or more cows, one ordinary large top milking 

 pail, one small top milking pail, and two glass bottles or jars.* 



The smaller the opening in the milk pail the better, so long as it can 

 be used conveniently for milking. Any of the style of pails shown in 

 the illustrations will give quite satisfactory results, and are easy to use. 

 If desired, any tinner can make a cover to go on an ordinary milking 

 pail, leaving an opening about six inches in diameter at one side through 

 which to milk. 



Both the pails and the sample jars should be thoroughly sterilized 

 either with boiling water or with steam before they are used. 



Milk one or more cows into the open milking pail, and after thoroughly 

 mixing -the milk, put a small quantity into one of the sample jars, cover- 

 ing the top so that dust cannot get in.f Next, milk the same number 

 of cows into the small top pail, and put a sample into the second jar 

 in the same way as the first. 



Now place the two jars of milk together where the temperature will 

 be the same for both jars, and watch them carefully for indications of 

 curdling. Record the time when each sample curdles, and determine 



Fig. 59. — Four good 



aiytci of small topped milk pails, 

 the opening 



This cut shows the size of 



the effect of the small top pail on the keeping quality of the milk. It 

 will be well to repeat this experiment several times in order to get satis- 

 factory data. 



* A pint fruit can or a common drinking glass can be used for sample jars, 

 flf a fruit can is used, place the glass top on without the rubber rmg, to allow 

 the passage of air. If a drinking gfass is used, cover the top with paper. 



